Charge state
Charge state is the level to which the battery is
charged. This state can be measured either by meas-
uring
the specific gravity of the battery acid in each cell,
or by measuring the voltage in each cell without a load.
The latter cannot be done on modern batteries as the
cell electrical connections are sealed and not accessi-
ble for measuring.
Measuring the voltage across the terminals provides
entirely incorrect information if one of the cells is defec-
tive. Instead, battery acid specific gravity must be
measured using a battery acid hydrometer. Specific
gravity differs with temperature. The lower the temper-
ature the higher the specific gravity.
Installation, Electrical System
47704162 10-2014 © AB VOLVO PENTA 129
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