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Should the battery be removed for recharging to avoid damage to the vehicle? Please pay attention to the type of charger. In many cases, valuable tips on charging in the vehicle can be found in the operating instructions of the vehicle manufacturer or in those of the charger manufacturer. In general, fully automatic chargers (charging voltage limitation with 14.8V) are well suited for charging the battery installed in the vehicle.


If your charger has an automatic mode with voltages >15.9V, the battery must be disconnected from the on-board electronics or removed from the vehicle. In the worst case the installed control units could be destroyed by overvoltages, the resulting damage would be enormous!


Attention: Observe the instructions of the vehicle manufacturer when disconnecting.


  • 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.


A charging voltage of 16V is recommended for deeply discharged wet batteries (disconnect the battery from the on-board electronics)!


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


Duracell Extreme AGM: 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!

Yes, essential.
A conventional starter battery is, as the name suggests, basically designed to provide a high short energy boost to start the vehicle.

As soon as the engine is running, the vehicle's charging system ensures that the energy taken from the battery is recharged and supplies all other electrical loads.


A start/stop battery is responsible for much more than just starting the engine.

Namely to supply the various electrical consumers with energy when the vehicle is stationary, the engine is not running (stops) and the complete on-board power supply including the next starting process must still be ensured!

This means that the technology and components of a start/stop battery differ significantly from those of a conventional starter battery.

Please note:
If a conventional wet battery is installed in a vehicle with start/stop technology, by mistake - due to an allocation error - or due to incorrect cost awareness, a battery breakdown or total failure is pre-programmed. Depending on the driving profile (short distance, stop-and-go,...) a conventional starter battery will be defective within a few months due to the extremely high cyclic load due to the engine start-stop function.

The battery breakdown also leads to the failure of various vehicle functions (including start-stop). Not to mention the customer's annoyance about the battery failure, possible loss of time, waiting for help, delays, scheduling problems and dissatisfaction with the installed spare battery.


Do not install a conventional wet battery in a vehicle with a start/stop function that is equipped with an AGM* or EFB** battery as standard. If necessary, an AGM or EFB battery must be used again - in identical housing and identical performance class.


Duracell Automotive Tip: The Extreme EFB battery can be upgraded to an even more powerful and cycle-resistant Extreme AGM battery in the L3/H6 (70 Ah) and L4/H7 (80 Ah) housing. Please contact your Duracell account manager for more information.


AGM = Absorbent Glass Mat, the acid is absorbed in the glass fleece and thus bound
EFF = Enhanced Flooded Battery, the cycle-proof starter battery

You can calculate the correct capacity for your Duracell Leisure 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 this case we would recommend the use of 4 Duracell Leisure DL115 (115Ah each), which you connect serially (2x12V=24V) and in parallel.

In view of the sensitive electronic components in the vehicle, as a rule starting assistance should only be provided by using a starting assist device.


  • 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.

The discharge of the battery is probably due to a high quiescent current requirement (>20mA) of the vehicle.


Charge the battery fully with an external charger (voltage limited to approx. 14.8V) and measure the voltage of the battery after a standing time of at least 5 hours.


The measured voltage should be in the range of 12.7 - 12.8V.


If voltage is above this, please switch on the dipped beam of your vehicle for approx. 10 seconds and measure the open-circuit voltage again after a waiting period of approx. 1 minute. If the voltage is below approx. 12.6V, you must restart the charging process.


If your charger has a "recovery mode", the battery must be removed from the vehicle before charging! Otherwise it is possible that the vehicle electronics will suffer irreversible damage due to excessive on-board power supply voltage.