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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.

A fully charged Duracell battery can be stored for around 12 months (at 20°C) without recharging. At 20°C, monthly self-discharge of approx. 3 per cent must be expected and the cooler the storage, the smaller the self-discharge.


To be on the safe side, check the open-circuit voltage of the batteries after approx. 3 months. If it is < 12.60V (but absolutely > 12.50V) the battery must be recharged immediately. If it is < 12.70V, carry out a new check after approx. one month. In the case of recharging outdoors, please ensure that the battery first reaches a temperature above 0°C so that a charge can be absorbed.
If charging is necessary, you can remove the battery and "defrost" it in rooms with >0°C, or simply leave the charger connected to the battery for a few days, at the beginning the charging energy is used to heat the battery. Don't worry, a fully charged lead-acid battery will freeze "only" at approx. minus 70°C. A discharged battery (open-circuit voltage = 12.0V) will freeze at a few sub-zero temperatures!


A few tips to note:

  • Duracell Extreme AGM batteries must not be refilled with distilled or demineralized water!
  • Before wintering, charge the battery fully (separately) until the display on the charger indicates this.
  • Disconnect all consumers from the battery (disconnect by disconnecting the battery or removing the main fuse).
  • Make sure that the surface of the battery is dry or remains dry.
  • If the battery is to be removed, it should be stored in a dry and as cool a place as possible (fully charged).
  • When storing the battery, install short-circuit protection.
  • Fully charge the batteries before installing them in the motorhome or before making contact with the vehicle electrical system.
  • Finally, the most important thing: Always use protective goggles when handling lead-acid batteries!


There are also chargers that automatically maintain the charge (all Banner Accuchargers). This allows the charger to remain connected to the battery throughout the winter without damaging the battery.

Duracell recommends using only batteries with an open-circuit voltage > 12.50V.


  • 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!

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