Maintenance and Service
Shutdown for a longer period of time
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Batteries useful life
To preserve the starting ability of the batteries in case of a shutdown period of more
than 2 weeks, the following notes must be observed:
– Check the liquid level. If it is too low, then exclusively fill up with distilled water to
the maximum acid level mark.
– The self-discharge rate amounts to about 0.2% of the nominal capacity/day at
20°C.
– To avoid deep discharge, the acid density must be checked at regular intervals. If
the acid density is below 1.21 kg/l, then the batteries must be recharged. The rec-
ommended charging current is 1/10th of the capacity.
– Deep discharged batteries form lead sulphate. Regeneration by recharging is no
longer possible.
– In case of batteries forming sulphate, detectable by the silver-coloured plate coat-
ing and turbid battery acid, there are neither guarantee nor warranty claims. They
are also excluded from any accommodation scheme, because this damage is
caused by gross negligence during maintenance.
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