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Maintenance free batteries also need care. Mainte-
nance free only means that the fluid level does not
need to be checked. Each battery suffers under
self-discharge, which may, in not checked occa-
sionally, even cause damage to the battery as a
result of exhaustive discharge.
The following therefore applies for the service life:
Switch off all consumers (e.g. ignition, light, inside light,
radio).
Check open-circuit voltage of the battery at regular intervals.
At least once per month.
Reference values: 12.6 V = fully charged; 12.3 V = 50% dis-
charged.
Recharge the battery immediately after an open-circuit
voltage of 12.25 V or less is reached. Do not perform quick
charging.
The open-circuit voltage of the battery occurs approx. 10 hours
after the last charging process or one hour after the last discharge.
After each charging process allow the battery to rest for one
hour before taking it into service.
For resting periods of more than one month you should
always disconnect the battery. Do not forget to perform reg-
ular open-circuit voltage measurements.
NOTICE!
Exhausted batteries (batteries with formation of
sulphate on the plates) are not covered under war-
ranty!
Open the engine hood.
Fig. 92 and battery compartment.
Clean battery poles and pole clamps and grease them with
pole grease (Vaseline).
Retighten the pole clamps.
Check the fastening of the battery.
Fig. 92
Maintenance – Every 250 operating hours
BW 900-50
75
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