Types of batteries

Low maintenance batteries

Low-maintenance batteries with liquid electrolyte. These rechargeable batteries can be recognized by the corks that come out of the cans.

Acid battery for which the electrolyte level should be checked at regular intervals and topped up with distilled water if necessary.

Batteries of this type are often equipped with an indicator that, using different colors, informs about the state of charge of the battery and the level of electrolyte in it.

Maintenance-free batteries

Maintenance-free batteries with liquid electrolyte. These batteries have a lid instead of corks over the banks. It covers the battery after it has been charged at the factory.

WARNING: Never remove the cap on the battery cans. The battery case may be damaged and the battery will fail.

Lead-acid batteries that do not need to be filled with distilled water under normal operating conditions are sealed batteries with absorbed electrolyte.

Batteries without liquid electrolyte (AGM batteries)

Lead-acid batteries in which the electrolyte is absorbed in glass fiber (AGM). The battery is closed and equipped with ventilation valves.

AGM is short for Absorbant Glass Matt (absorbent fiberglass pad).

NOTE: The procedure for testing and charging gel batteries and batteries without liquid electrolyte is the same. If it is necessary to replace a battery without liquid electrolyte, be sure to install a battery of the same type.

Gel batteries

Maintenance-free battery with adsorbed electrolyte.


Lead-acid batteries in which the electrolyte is absorbed in a gel. The battery is closed and equipped with ventilation valves.

Fastening the battery terminals

The battery terminals may only be pushed onto the terminals by hand and without the use of force.

Do not lubricate battery terminals.

The terminals should be fitted so that the leads are flush with or protruding from the terminals.

Once the terminals have been tightened to the prescribed torque, no further tightening is allowed.