1
Vetus maintenance-free batteries
GREEN DOT
ALL DARK
CLEAR
62
6 Maintenance
Battery, cables and connections
Every 100 operating hours.
22 Checking specific gravity
Every Vetus Maintenance-free battery has a
hydrometer (1) built into the cover.
Visual inspection of the hydrometer will show
one of three conditions:
23 Hydrometer operation
Green dot visible:
State of charge 65 % or more.
Dark:
State of charge less than 65 %. Recharge im-
mediately.
Clear or light yellow:
Electrolyte level low.
In case of low level, caused by overcharging
the battery for a long period of time with a
voltage too high, replace battery. Check alter-
nator and/or voltage regulator.
VD00121, VD00122, VD00123
VD00118
Summary of Contents for M Series
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