Frequently asked questions (FAQs)

The following FAQs should enable you to obtain information concerning the advantages and employment of Banner batteries in a quick and efficient manner. Equally, you will find answers to your questions via the FAQ search and day selection.

Enter the search term

Top 5 questions

  • I need a degassing elbow and hose

    • The degassing elbow including the hose (part number: 10300017000) is available at every Banner sales partner.

      The Retailer finder shows the nearest Banner sales partner:
      http://www.bannerbatterien.com/banner/unternehmen/haendlerfinder/index8.php

      Insert the degassing hose by using the elbow at the central degassing opening at the side of the battery cover.
      No additional work is necessary.

      Tags:
  • Installing of batteries without BEM Code

  • May I change the degassing side of the battery?

    • The "EN types" Power Bull (total height 175 or 190mm) and Running Bull AGM and EFB have their central degassing vent on either the left-hand side (- terminal) or on the right-hand side (+ terminal). The other side is sealed with a removable plug.

      If, as in your case, the degassing vent is on the unsuitable side, the plug can be removed. Warning! The plug must then be inserted into the degassing vent on the other side.

      Please use a wooden screw with a 5mm diameter for removal of the plug. Insert the screw manually into the small hole in the plug, turn and then pull out both the screw and the plug. There is no need to worry, as the plug cannot be screwed into the battery.

      The "EN types" Starting Bull (total height 175 or 190mm) have their central degassing vent on either the left-hand side (- terminal) or on the right-hand side (+ terminal). Please note: there is no change possible, if the degassing vent is on the unsuitable side!
  • What should I look out for when recharging a battery?

    • – Before charging a wet battery, check the electrolyte level and top up if necessary with de-ionised or distilled water to the maximum acid level mark, or 15mm above the upper edge of the plates.

      Should the battery be removed prior to recharging in order to prevent damage to the vehicle?
      Please note the charger type. The operating instructions of the vehicle or the charger manufacturer frequently contain valuable tips regarding battery charging in the vehicle.
      In general, a fully automatic charger (charging voltage limitation of 14.8V) is well suited to the charging of a battery installed in a vehicle.

      Should your charger have an automatic mode with voltages >15.9V, it is vital that the battery be separated from the in-board electronics and removed from the vehicle.
      In a worst case scenario it is possible that the installed control devices can be destroyed due to overvoltage and the resulting damage would be enormous.

      Warning! Follow the vehicle manufacturer’s instructions when disconnecting the terminals.
      – Batteries may only be charged with direct current. Connect the positive (+) battery terminal to the positive (+) terminal of the charger, and the negative (-) battery terminal to the negative (-) terminal of the charger.
      – Do not switch on the charger until the battery has been disconnected. When charging is completed, switch off the charger before disconnecting the battery.
      – It is recommended that the charging current be equal to one tenth of the capacity (e.g. 44Ah divided by 10 = 4.4A charging current).
      – The temperature of the acid may not exceed 55°C during charging. If the temperature rises above 55°C, the charging process must be discontinued.
      – The fittings must not be opened.
      - Ensure that recharging amounts to 1.2 times the consumed capacity (e.g. consumed capacity 30Ah, recharge 36Ah)
      – Charging must be performed in a well-ventilated room.
      – Charging is finished when the current drops to 0 or stops falling, or if the automatic charger switches off.


      For deep discharged flooded batteries we recommend a charging voltage of 16V (separate the battery from the onboard electronics)!

      Warning! Oxyhydrogen gas is formed during charging! It is essential that fires, sparks, open flames and smoking be prevented!

      Running Bull AGM/BackUp: only recharge with a voltage controlled charger (max. 14.8V)! The use of standard, non-voltage controlled chargers will dest­roy the battery through overloading and cause the electrolyte to escape!
  • What should I look out for when installing a battery?

    • Banner recommends only fit batterie with an open circuit voltage > 12,50V inside a vehicle.

      – Before fitting or removing the battery, switch off the engine and all power users.
      – Avoid short circuits due to tools.
      – When removing the battery, first disconnect the negative (-) terminal and then the positive (+) terminal.
      – Prior to fitting the battery, clean the battery compartment.
      – Ensure that the battery is secured tightly.
      – Clean terminals and battery clips and lubricate lightly with acid-free grease.
      – When fitting the battery, first connect the positive (+) terminal and then the negative (-) terminal. Ensure that the clips are secured.

      Warning! Always follow the instructions (operating or maintenance) of the vehicle manufacturer!

More FAQs

  • My battery is getting discharged in the car.

    • The discharging is most likely caused by a high closed current (>20mA) of the vehicle.

      Recharge the battery with an external charging device (constant voltage with max. 14.8V) completely full and measure the open circuit voltage after a rest time of min. 5 hours.

      The measured voltage should be approx. 12.7-12.8.

      If the voltage is higher please turn on the lights for 10 seconds and repeat the measurement again after 1 minute.
      If the voltage is under 12.6V you have to charge the battery again.

      If your charging device has a kind of "reconditioning mode" disconnect the battery from the on board electronics to avoid irreversible damages.
      Tags:
  • May I use the different types of batteries together in a parallel or sequential combination?

    • One should not combine different kind of batteries as they are of differing design. Consequently, the batteries demonstrate varying internal resistance and charging behaviour.

      The following can occur:
      - A battery or a group of batteries will either not be charged or overloaded.
      - High levels of compensation current will flow, which will lead to fuses going down or cable overheating.

      One must always observe the following during the parallel or sequential combination of batteries:

      - The batteries must have roughly the same age!
      - The batteries should have the same off-load voltage.
      - The batteries must carry an identical type designation!
      - The connecting cables should be as short as possible.
      - Care should be taken that the connecting cables have sufficient dimensions.
      Tags:
  • How can I check the cold crank current in an Energy Bull battery?

    • The Energy Bull is designed as a deep-cycle battery for cyclical applications and is therefore not a starter battery.

      For this reason you will not find any information regarding the cold checking current.

      A capacity check (RC, K5 or K20) is recommended for the functional examination of such batteries. However, do not forget that prior to the check the battery must be correctly charged for 24 hours with 16V.

      In general, quick testing devices that attempt to calculate a cold start value have very limited validity
      (see the Technical Newsletter No.2 “Chances and risks of quick testing devices” and No.7 “Cold start measurement using quick testing devices”).

      However, these devices are entirely unsuitable for deep-cycle batteries.
  • How should I look after my Banner battery in winter?


    • A fully charged battery can be stored till the open circuit voltage is 12,50V.

      Depending on the temperature batteries can be stored up to 12 months without recharging.

      The colder the storage temperature the lower the self discharging rate.


      In order to be rather safe than sorry, it is advisable to check the off-load voltage of the battery after roughly three months. If this is < 12.50V, the battery should be recharged, while with < 12.60V another check after about a month is to be recommended.

      When recharging outdoors, care should be taken that the battery temperature must rise to over 0°C in order that it will accept a charge.

      If recharging is required, the battery can be removed and left to “thaw” in a room with >0°C. Alternatively, the charger can be connected to the battery for several days, as the charge energy is employed initially to heat up the battery.

      There is no need for concern, as a fully charged lead-acid battery only freezes at approx. minus 70°C. However, a discharged battery (off-load voltage = 12.0V) freezes at just a few degrees below zero.

      A few tips to note:
      - Prior to recharging top up missing electrolyte with distilled or demineralized water to the maximum level.
      - Before winter decommissioning, recharge the battery (separately) until the charger gauge shows that it is fully charged.
      - Ensure that surfaces of the battery are dry and remain so.
      - If the battery is removed from the vehicle, it should be stored in a dry place that is as cool as possible (fully charged).
      - When storing the battery, provide it with short circuit protection.
      - Fully charge the battery prior to installation in the vehicle and contact with its electrical system.
      - Last, and most importantly, always use protective eyewear when handling lead-acid batteries.

      Suitable chargers are available for automatic charge retention (all CTEK devices). Such chargers can remain connected to the battery throughout the winter without causing it any damage.
  • How can I best open the stoppers on Banner batteries?

    • To open the cell stoppers it is necessary to remove the top label.

      In order to open the cell stoppers it is essential that you employ a correspondingly large slot screwdriver or Banner’s special “Stopper Key”.

      The screwdriver should have a blade width of at least 14mm (maximum 16mm). This is because the use of a screwdriver that is too small will damage the stopper or the cross recess and thus make removal impossible.



      402d4510e5d9c265c1257b1a00411ffc/Antwort/0010e.gif?OpenElement&FieldElemFormat=gif" width="152" height="211" />
      /DealerSearch/import/load/customercare/402d4510e5d9c265c1257b1a00411ffc/Antwort/0010e-2.gif?OpenElement&FieldElemFormat=gif" width="144" height="138" />
  • Can I determine the date of manufacture of my Banner battery?

    • The physical age of a battery has only very limited significance with regard to its service life and health. For this reason, the coding stamp on Banner batteries does not provide any self-explanatory conclusions regarding their age.

      Decisive is not the date of manufacture, but rather that of vehicle start-up, as only then does the starter battery become subject to loads and the electrochemical wear process begin.

      As long as it is maintained in a charged condition, which is the certainly the case of Banner and its contracted retailers, a battery does not “age” in the period between production and sale. Battery life is determined to a far greater extent by the number of charging and discharging cycles than it is by physical age. Therefore, the only documentation for a warranty and guarantee is the dated battery purchase receipt.

      P.S. A dot marking with a sequence of numbers, as in the case of tyres, etc., which evidences the production date (dot= Department of Transportation, USA) is unnecessary in the case of batteries.
  • Who is the winner in the latest battery test 2012 carried out by Stiftung Warentest, ADAC and TCS ?

    • Banner Power Bull wins the Stiftung Warentest and ADAC 2012 conventional starter battery test.
      In the latest 2012 battery study carried out by Stiftung Warentest in conjunction with ADAC, the German Automobile Club, the Banner Power Bull P72 09 battery was awarded a top “very good” rating (1.4) and was thus the winner of the conventional starter battery category. This is the first occasion in this millennium that the test panel has given a “very good” to a starter battery. Moreover, the Austrian starter battery specialist also subjected its Running Bull EFB and AGM start/stop batteries to what is Europe’s toughest and most independent battery test and emerged with two “goods”.

      As a delighted Andreas Bawart, the Banner Group’s commercial CEO, explains: “Stiftung Warentest last scrutinised starter batteries in 2007 and therefore it is all the more important for us that our Power Bull quality battery was allocated the highest “very good” grade, especially as up to now such a rating had not been awarded in this millennium.” Three conventional starter batteries from Banner, Bosch and Exide in the 72 Ah capacity class were tested and the Banner Power Bull P72 09 not only triumphed overall, but was also ahead on points in the individual categories comprised by durability, performance characteristics and performance specification fulfilment.

      For further information see the Internet-link:
      http://www.bannerbatterien.com/banner/aktuelles/news/artikel/batterietest-2012-11.php
  • How often must I check the electrolyte level in an Energy Bull or Buffalo Bull?

    • The electrolyte level must be checked in line with frequency of use and charge voltage.

      - In the case of daily charging or discharge, the intervals between electrolyte checks should amount to one month.
      - In the case of weekly charging or discharge, maintenance should take place on a quarterly basis.

      Before handling the battery, it is essential that you put on your personal protection equipment (safety eyewear, ...). Only use de-ionised or distilled water for topping up the electrolyte (no mineral or spring water).

      - Open the cell plugs with an appropriate tool.
      - Top up the cell as far as the maximum marking (see the marking on the outside of the casing or the cell clip).
      - Close the cell plugs.
      - Fully charge the battery in order to thoroughly mix the electrolyte (the battery should gas).

      Plate parts that are not covered with acid will be damaged irreversibly!
  • Can I also use an Running Bull AGM battery in a lateral position?

    • In principle, the AGM battery is not foreseen for use on its side. However, owing to the battery’s design it is nonetheless possible to employ it in this position. In spite of this fact, a degassing hose should be fitted (for safety reasons). In an unfortunate situation (damage to the charger or the battery), acid can escape more easily when the battery is in a lateral position. Moreover, depending upon the application (living area, starter,...) this installation position may lead to slight limitations on service life.
  • What is meant by a parallel connection?

  • What is meant by sequential connection?

  • How can I calculate the capacity requirement for my hobby or leisure battery?

    • You can calculate the correct capacity for your Energy Bull as shown in the following example:
      You need a battery for an electrically powered boat. A 600W e-motor is used with a 24V electrical system. In addition, a radio, various navigation lights and a depth sounder have to be supplied with power (total 50W). Five hours of autonomous operation are required.

      These values are now used in the following equation:

      Wattage: Volt = Ampere x Hours x Safety Factor = Battery Capacity in Ah
      i.e. 650 : 24 = 27 x 5 x 1.7 = 230Ah (k20)

      A safety factor of 70% should be used for wet batteries (30% for AGM and gel recombination batteries). In the case above, two Energy Bull 968 01 batteries (230Ah each) used in sequence would be advisable.

      Downloads: ATT0VDN8.jpg
  • Maintenance of Banner batteries

    • In order to ensure maximum battery life, the following instructions should be followed:
      – Keep the surfaces of the battery clean and dry.
      – Check the acid levels regularly and if necessary top up with desalinated or distilled water. Never top up with acid. If a substantial water loss occurs, an expert should check the voltage regulator.
      – Do not put so-called additives into the battery acid.
      – The level of charge of the battery can be checked by means of acid density or open circuit voltage measurement If the density of the acid is below 1.24 or 12,50V kg/l the battery must be recharged .
      - In case of saisonal driven vehicles we recommend an external charging twice a year. In either case the battery must be fully charged before taking out of service.

      Running Bull AGM/BackUp: the charge status can only be determined via the off-load voltage. The battery is to be recharged in the case of off-load voltage of ≤12.50V (see Note 4). Acid density measurement, or topping up with distilled water, is not possible.
  • After buying a starter battery how do I put it into operation?

    • Only a few types of batteries are dry charged.

      All the other batteries are ready for use (filled and charged)

      Dry-charged, starter batteries are ready for use as soon as they have been filled with acid. They do not require special charging.
      – During filling, the temperature of the battery and acid should amount to at least 10°C.
      – Remove the vent plugs.
      – At a maximum, fill the individual battery cells with sulphuric acid pursuant to VDE 0510 with a density of 1.28 kg/l (1.23 kg/l for tropical countries) up to the acid level mark, or 15 mm above the top of the plates.
      – Leave the battery to stand for 20 minutes for the level to settle, gently tip it several times and then top up where necessary.
      – Screw or press in the vent plugs tightly, wipe off any surplus acid splashes.
      - Before mounting the open circuit voltage must be min. 12.60V or an acid density of 1.26kg/l


      Activation charge: If the battery becomes warm at filling, if the electrolyte froths up (intense formation of gas) or if the battery does not reach the values mentioned above after the filling and charging time, an activation charge has to be effected.
  • What do I have to look out for when storing or transporting batteries?

    • – Empty batteries do not need maintenance. Store in a dry and cool environment (frost-free).
      – Recharge filled starter batteries when acid density is below 1.24 kg/l (off-load voltage < 12.50V).
      – Filled batteries must be transported and stored in an upright position to avoid acid spillage.
      – During transportation secure the battery in order to prevent it from falling over.
      - Use a short circuit protection

      Running Bull AGM/BackUp: leak-proof even when upside down and in the case of damage to the casing. At the latest, recharge in the case of off-load voltage ≤ 12.50V. Acid density measurement and topping up with distilled water are not possible.
  • What do I have to look out for when using a starter?

    • – In view of the sensitive electronic components in the vehicle, as a rule starting assistance should only be provided by means of a Banner Booster.
      – Starting assistance from vehicle to vehicle can lead to voltage peaks during disconnection, which can damage or even destroy vehicle electronic systems.
      – Therefore, it is essential that the following procedure be strictly observed when using starter cables!
      – Standardised starter cables (e.g. in accordance with DIN 72 553) should always be used for giving starting assistance.
      – Observe the instructions for use of the starter cables.
      – Only connect batteries with the same nominal voltage.
      When connecting the terminals, both vehicle engines must be switched off!
      First connect the two positive terminals 1 with 2. Then connect the negative terminal of the assisting vehicle 3 with 4, the blank metallic point on the vehicle needing assistance, away from the battery. (Observe the instructions of the vehicle manufacturer.)
      – Now start the vehicle needing assistance for a maximum of 15 seconds. Do not start the assisting vehicle.
      – When disconnecting the terminals, remove the cables in the reverse sequence to the above.

  • How do I commission a motorcycle battery?

    • In order to achieve full performance and service life, the battery must be fully charged prior to installation.

      1. Bike Bull
      Preparation. The degassing vent is closed and must be opened before putting into operati­on. Remove the protective cap, or cut off the degassing hose at the end.
      Filling. Remove all battery stoppers. Only use special acid (density 1.28 kg/l), which is supplied with the battery in a special plastic container. Fill to the maximum mark and then allow the battery to rest for 30 minutes.
      Warning! The acid container with any residual acid should be brought to a hazardous was­te collection point. Acid residues may not enter the sewerage system. Empty acid containers should be disposed of as domestic plastic waste.
      Commissioning. In order to reach full performance, once the battery has been filled with acid it must be fully charged prior to installation. In accordance with the instructions for use of the charger and the battery, charging can take place for approx. 5-10 hours at a maximum of one-tenth of battery capacity (Ah).
      Battery capacity can be ascertained by means of the DIN number on the individual box. Num­bers 2 and 3, e.g. 509 14 have 9 Ah capacity and therefore require charging current of approx. 0.9 A. After charging, the acid level should be checked and if necessary topped up with demi­neralised water. The battery can then be closed with the stoppers.
      Please note! The Bike Bull cannot be installed in a lateral position!
      Maintenance. Never allow the acid to fall below the minimum level. Only use demineralised water (desalinated or distilled water according to VDE 0510).

      2. Bike Bull AGM
      Preparation. Remove the battery seal shortly before filling. A slight hissing sound can be heard.
      Filling. Only use special acid (density 1.32 kg/l), which is supplied with the battery in a special plastic container. Then allow the battery to rest for 30 minutes. After filling, the battery is closed with the stopper strip and may not be reopened, as this would destroy the battery! Warning! The acid container with any residual acid should be brought to a hazardous was­te collection point. Acid residues may not enter the sewerage system. Empty acid containers should be disposed of as domestic plastic waste.
      Commissioning. In order to reach full performance, once the battery has been filled with acid it must be fully charged prior to installation. In accordance with the instructions for use of the charger and the battery, charging can take place for approx. 5-10 hours at a maximum of one-tenth of battery capacity (Ah). Battery capacity can be ascertained by means of the DIN number on the individual box. Numbers 2 and 3, e.g. 518 21 have 18 Ah capacity and therefore require charging current of approx. 1.8 A.
      Please note! The Bike Bull AGM cannot be installed in a lateral position!

      3. Bike Bull AGM+SLA
      Putting into operation. In order to reach full performance, the battery must be fully charged prior to installation. In accordance with the instructions for use of the charger and the battery, charging can take place for approx. 5-10 hours at a maximum of one-tenth of battery capacity (Ah). Battery capacity can be ascertained by means of the DIN number on the individual box. Numbers 2 and 3, e.g. 520 01 have 20 Ah capacity and therefore require charging current of approx. 2 A.
      Please note! The Bike Bull AGM+SLA can be installed in a lateral position!
      Use of a voltage controlled Banner Accugard Bike, Banner Accugard Car or Banner Powertool 3600 charger is recommended.
      Warning! Never install a maintenance-free battery (AGM, AGM+SLA) in a motorcycle without a regulator, as the maximum voltage may not exceed 14.8 V.
  • Information of charging gases

    • Under circumstances detonating gas is formed when charging a battery.
      Detonating gas is a high explosive mixture of hydrogen and oxygen.
      Due to the low explosive limit of 4 vol.% extreme caution is necessary.
      When exposed to an ignition source (open flame, hot surface, electrostatic discharge,...) the gas causes an explosion-like reaction with a detonation speed amounts to approx. 2,800 m/s (black powder 400-1000 m/s).

      Please note:
      - Avoid ignition, do not smoke or use open flames and prevent sparking during the handling of cables and electrical appliances.
      - All electrical devices with switches should be turned off prior to battery installation or removal, in order to prevent accidental sparking.
      - When releasing the connections, first detach the mass cable (link with the vehicle frame). During connection this is the last cable to be attached (avoid short circuits due to tools).
      - During charging, first attach the battery to the charger and then switch on the charger.
      - Ensure good ventilation during charging in closed rooms.
      - Use a degassing hose when the battery is installed inside the vehicle.
      - Always use protective eyewear when handling lead-acid batteries.
  • Is battery acid caustic?

    • Battery acid is extremely caustic!
      - In the case of contact with the eyes rinse them out thoroughly with water and consult a physician.
      - Acid splashes. Treat with a neutralon spray or suds, rinse with plenty of water and wipe dry.
      - Acid or batteries with an acid filling should not get into the hands of children.
      - Batteries containing residual acid should be brought to a hazardous waste collection centre. Acid residues may not enter the sewerage system. Empty acid containers should be disposed of as domestic plastic waste.
  • How can I mothball my motorcycle battery in winter?

    • Should the bike not be used or be garaged for a lengthy period (standstills or winter mothballing), remove the battery and store it in a dry and cool place (frost-free). It is essential that the battery be fully charged and gets recharged when reaching 12.50V or connect it to a charge retention device (e.g. Banner Accugard Bike).

      Ideally, you should use a voltage-regulated charger (Banner Accugard Bike, Banner Accugard Car or Banner Powertool). These devices carry out charging automatically and depending on the battery capacity, you can employ the following chargers:

      < 9 Ah - Banner Accugard Bike - Art.No. 1240001500
      9-20 Ah - Banner Accugard Car - Art.No. 1240001600
      > 20 Ah - Banner Powertool 3600 - Art.No. 1240003600

      - Remove the battery from the vehicle and under all circumstances unclamp the battery cables (minus terminal first). Warning! Without a power supply, in-board computer and radio data, etc. can be lost!
      - First connect the charger to the battery and then switch on. Following charging, first switch off the charger and then disconnect it from the battery.
      - Charging current: max. 1/10 Amp of the battery capacity.
      - Stop charging at an acid temperature of more +55°C.
      - After charging, check the electrolyte level and if necessary top up with distilled or de-ionised water (only applies to wet batteries, not to AGM or AGM+SLA batteries!).
      - Ensure good ventilation when charging. Highly explosive oxyhydrogen gas forms during charging. Therefore, it is vital that smoking, open flames and sparks be prevented.
  • Must I use a degassing hose when the battery is installed inside the vehicle?

    • We prescribe the use of a degassing hose whenever a lead-acid battery is installed inside the vehicle.
      Should a degassing hose connection (central degassing) be unavailable, the battery must be insulated from the interior using the appropriate means. In addition, the appropriate air intake and exhaust vents are to be installed.

      Oxyhydrogen is a mixture of hydrogen and oxygen.
      When exposed to an ignition source (open flame, hot surface, electrostatic discharge,...) the gas causes an explosion-like reaction. The detonation speed amounts to approx. 2,800 m/s (black powder 400-1000 m/s).

      As a consequence of the minimal lower explosion limit of 4 Vol% a detonation caused by battery gas emissions is entirely possible. Therefore, for your own safety always use protective eyewear when handling lead-acid batteries!
  • What must I look out for when connecting two batteries?

    • Please note the following:
      - Both batteries must have roughly the same age!
      - Both batteries should have the same off-load voltage.
      - Both batteries must bear an identical type designation!
      - The connecting cables should be as short as possible.
      - Care should be taken that the connecting cables have sufficient dimensions.
  • Can I charge the on-board supply battery sufficiently when driving?

    • As a result of our experience, we know that sufficient charging of the battery when driving is unfortunately only possible to a very limited extent. Particularly in summer (air conditioning running at high power, lights on, radio playing, refrigerator running,...) there is very little residual current for the complete recharging of a battery. In some cases, the living area battery must even support the on-board supply ...

      The use of a B2B charger represents a sensible approach. At the very least, these devices serve to raise the charged voltage to a reasonable level.

      If, for example, your batteries are approximately 50% discharged (95A are missing) some 105 Ah have to be recharged in order to bring the battery up to full power.

      At best, 15A (on average) remain for the living area battery and this means that you would have to drive your vehicle for at least 7h in order to achieve full charging!

      In order to obtain the maximum service life from your battery, please ensure complete separation from the on-board supply when the vehicle is not in use (>7 days).
      --> Appropriate full charging of the battery should take place beforehand ...
  • What values should I use when setting an external charger for AGM batteries in the caravan? How high should the charging and float charge voltage be?

    • Please employ the AGM setting, which means that the charge voltage should be set at max. 14.8V and the float charge voltage at 13.5V. Best of all, use an IUoU characteristic with temperature compensation (should you have this setting available).

      In order to obtain the maximum service life from your battery, please ensure complete separation from the on-board supply when the vehicle is not in use (>7 days).
      --> Appropriate full charging of the battery should take place beforehand ...
  • I use several identical batteries in a sequential or parallel combination. What do I have to look out for during a battery exchange?

    • Please always exchange all the linked batteries.

      This is essential because with cumulative use, batteries demonstrate a change in their internal resistance (increase). Accordingly, a new, fully charged battery has very low internal resistance, while an “old” battery has a very high one.

      Should an “old” and a “new” battery be connected, the flows (with parallel connection) and voltages (with sequential connection) spread in a different manner, which creates asymmetric loading during charging and discharging.

      If the batteries are not discharged or charged, parallel connection results in flows of very high compensation current between the batteries.
      --> The “new” battery attempts to recharge the “old” one (potential compensation)

      This compensation current can result in an early failure of the “new” battery.
  • What is the lowest voltage level to which I may discharge a Running Bull AGM battery ?

    • At a maximum, an AGM battery may be discharged to a level 50% state of charge.

      Basically, it can be said that the deeper the discharge, the shorter the battery life expectancy. With a discharge depth of 50% (approx. 12.3V off-load voltage) an AGM battery manages roughly 400 cycles.

      Please ensure that immediate recharging takes place as soon as an off-load voltage limit of around 12.50V is undercut.

      In order to be able to measure off-load voltage, a period of around five hours should elapse following charging, or no discharge should have taken place for at least an hour.
  • Is it possible for me to use a Banner Energy Bull in a self-built motor caravan (with solar cells, inverter, ...) as a supply battery?

    • Finding the right battery for use in a motor caravan is not that simple. The text below is intended to provide some explanations regarding the Energy Bull and shed some light on alternative possibilities.

      Charging:
      Pay close attention to the appropriate dimensions of the feed cable (in order to minimise voltage loss).

      The charging voltage for Energy Bull batteries should amount to 14.2 – 14.4V. In order to achieve suitable battery life, the charging current should not amount to more than five times the rated current* (see subsequent calculation).

      All in all, the Energy Bull is a good cyclical battery, which forgives a great deal (as opposed to gel or AGM batteries). The “disadvantage” of Energy Bull batteries as compared to AGM or gel batteries relates to maintenance. For when an Energy Bull battery is employed, it is imperative that the electrolyte level is checked regularly. During intensive use (camping operation) this should take place on a monthly basis, otherwise quarterly and half-yearly inspections are sufficient.

      Gel and AGM batteries are maintenance-free.

      A reasonable price, insensitivity to high temperatures and higher charging voltages are all positive factors in favour of the Energy Bull.

      Solar cells
      In the case of solar cells make certain that you have a “good“ regulator. Ideally, this should have pulse-width modulation (PWM), temperature compensation and freely selectable parameters (charging voltage...).

      Discharging
      Inverters require a sizeable amount of discharge current from the battery.
      In principle, Energy Bull and gel batteries are unsuitable for high current discharges (>40 times the rated current* for >1min).
      Should you require increased amounts of discharge current, we recommend the use of an AGM battery (Running Bull).
      *--> Calculation of the rated current follows!

      Capacity
      It is preferable that the batteries are only operated with low discharge depths.
      A lead-acid battery can withstand a certain degree of capacity conversion (= number of conversions of the rated capacity).
      The flatter the cycle, the higher the number of possible repeats.
      As far as cyclical capability is concerned, if handled with care the gel battery offers roughly twice the service life of an Energy Bull.
      Our online capacity calculator (see the subsequent link) offers excellent assistance for the calculation of the required capacity.

      Degassing
      Should the battery be installed inside the vehicle, it must be fitted with a degassing hose with an external outlet. When selecting a battery please choose a type that has a central degassing connection.
      --> This allows the gases created during charging (hydrogen and oxygen) to be conducted out of the vehicle.

      In a normal operational condition, AGM and gel batteries do not generate any gas (exception: a charger or battery defect). However, for safety reasons a degassing hose must be employed.

      Energy Bull batteries generate gases during standard operation and therefore it is essential that a degassing hose is used.
      *Rated current calculation

      Example: 100Ah (K20) Energy Bull 95751
      Rated current (In) = 100 Ah: 20 h = 5A
      Maximum charging current = 5 x In = 25A