142 W9215-8135-1
06/2021
Maintenance
Battery - load
Open the engine hood (page 112).
Check the electrolyte level in the battery (page 141).
Remove the negative terminal cover and take off the cable clamp. Move the clamp to the side so as to avoid
contact with the negative terminal.
Remove the positive terminal cover.
Connect the battery charger to the battery according to the instructions of the charger manufacturer. Choose
the normal (gentle) charging method.
Clean the battery after charging and replenish the electrolyte, if necessary.
Check the acid density with a hydrometer. The acid density should be between 1.24 and 1.28 kg/l. If the acid
density differs considerably among the individual cells of a battery, the battery probably has a damage. Check
the affected battery with a battery tester and contact trained personnel.
Close the engine hood and secure it with a padlock.
Battery acid is very caustic. Avoid contact with battery acid under all circumstances. If clothing, skin
or eyes have come into contact with battery acid, rinse the affected parts immediately with water. If
th
e eyes are affected, immediately seek medical attention! Neutralise spilled battery acid immediately.
When servicing a battery, always wear suitable protective gloves and eye protection.
Charge batteries only in sufficiently ventilated rooms. Smoking, uncovered lights or fire are not al-
lowed in these rooms.
Explosive gas is created when charging batteries. Open flames can cause an explosion.
Remove the plugs when charging batteries that are virtually empty. If the batteries are merely being
recharged, the plugs can be left in the batteries.
The battery can only be charged if the starter switch is in the STOP position and the key removed.
If the battery is charged when installed in the vehicle, the engine hood must be left open during the
charging procedure. After the charging procedure is completed, the engine hood must be left open
for ventilation for about 1 hour prior to start-up.
Risk of explosion.
When disconnecting and connecting the battery, always observe the specified order Risk of short
circuit.
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