This site uses cookies. Cookies are used for user guidance and web analytics and help to make this website better and more user-friendly. If you do not want a recording, you can disable it under Legal notice & privacy statement





Frequent short trips, stop-and-start traffic, below zero temperatures and additional electrical loads have reduced the starting power of your battery. To avoid a battery failure, you should charge the battery in the spring and autumn at least. It is best to always combine external charging with changing the tyres. We will show you what to look out for when charging vehicle batteries.


Accucharger Sortiment

Frequent journeys over a short distance, irregular driving profiles along with stop-and-start traffic, daily cold starts in the icy temperatures last winter, additional electrical consumers such as heated seats and parking or rear window heating have lowered the energy level of your battery start for start and journey for journey.

Treat your battery to an extra boost of external recharging now!


Which charger do I need to use?
As a general rule, fully automatic chargers (charging voltage limitation with 14.8V) are well suited for charging the battery installed in a vehicle. These charging devices are fully automatic. Depending on the battery capacity, we recommend the following chargers:


We also recommend the battery tester so that you can periodically check the battery voltage. BBT DBA - Digital Battery Analyser

In general, the following applies for charging batteries:

It is essential that you check the open-circuit voltage with a battery tester or voltmeter. Please make sure to recharge the battery as soon as an open-circuit voltage limit of 12.5V has been reached. To be able to measure the open-circuit voltage with a battery tester or voltmeter, you should wait approx. 5 hours after you have finished charging the battery (internally by alternator, externally by charger), or it has not been discharged for at least 1 hour.

Video: Autobatterie richtig laden
Banner HOW TO: Correctly recharge your car battery with the Banner Accucharger 6A Recovery

Correctly recharge your car battery with the Banner Accucharger 6A Recovery

  • Attaching the Accucharger in the car

    • Before charging, check the electrolyte level and, if necessary, fill up desalinated or distilled water to the max. acid residue mark or 15 mm above the upper edge of the plate.
    • The battery screw connections must not be kept open during charging and it is best to close them again.
    • Running Bull AGM/BackUp: AGM batteries must not be opened! It is not possible or necessary to measure the acid density or refill distilled water.
  • Connect the red clamp to the positive terminal and black clamp to the earth terminal*.

    • This is particularly important in modern vehicles due to the battery sensor, as otherwise the sensor cannot recognise the charging current correctly and may generate an error message. Once again: The charging current must run over the sensor, otherwise the control unit does not know that the battery has been charged and will issue a message saying “Restart not possible” in the worst-case scenario.
    • *The recommendation was already made earlier, at that time due to the formation of sparks when coming into contact with the negative terminal. (Earth = metallic smooth point away from the battery).

  • Connect the Accucharger to the 230V socket.

    • Do not switch on the charger until the battery has been connected.
    • We recommend a charging current of one tenth of the capacity (e.g. 44Ah: 10 = 4.4 A charging current).
    • For automatic chargers, such as the Banner Accucharger, this is set automatically.
  • Charging starts automatically

    • The Accucharger automatically charges the battery with the recommended charging current.
    • During charging, the temperature of the acid must not exceed 55°. If this is exceeded, you must stop charging the battery. 
    • Display of battery charge in percent.

    • When the battery charge is at 100%, it automatically switches to charge retention mode.

    • Ensure good ventilation when charging.

  • Tip from Banner: BBC Charging Quick Connector

    • This works well for hard-to-reach batteries.
    • The LED comfort display informs about the charging status. 
    • The BBC Charging Quick Connector can remain in the car permanently.
  • Unplug and disconnect the Accucharger.

    • The battery is fully charged when the current drops to 0 or no longer decreases or the automatic charger switches off itself. 
Bild 1 von 6
Accucharger 3A
Banner Accucharger – for professional battery charging and charge retention. Simple, fully automatic, safe and fast.

In general, the following applies: 

Fully automatic chargers (charging voltage limitation with 14.8V) are well suited for charging the battery installed in a vehicle. If your charger has an automatic mode with voltages >14.8V, the battery must be disconnected from the on-board electronics or removed from the vehicle altogether. In the worst case, the installed control units could be destroyed by overvoltage, the resulting damage would be enormous!

Please pay attention to the type of charger. Valuable tips on charging the vehicle can be found in most of the operating instructions issued by the vehicle manufacturer or the charger manufacturer!

All values quoted refer to a room temperature of +25°C. Caution: Temperature compensation in case of deviation.