The exterior of the battery
is clean and free of dirt (it is
forbidden to clean the battery
with water). Pay special
attention to check whether the
vent hole is breathable and
whether the surrounding of the
terminal post is dirty, whether
the positive and negative
terminal posts are fastened
in place, and whether the
positive and negative terminal
posts are fastened in place.
Under the temperature of 68 ℉
(20 ℃ ), the specific gravity of
the electrolyte in the electrolytic
cell is 1.28 when measured
with an electrolyte hydrometer;
if the specific gravity is less
than 1.24, the battery needs
to be charged (note: please
refer to the comparison table
of temperature and electrolyte
density for the change of
ambient temperature);
For maintenance-free
batteries, in addition to
measuring the specific gravity
of electrolyte, it is necessary
to check the color of the
charge state indicator lamp
(commonly known as the
electric eye) on the battery
(see the battery label for
instructions).
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