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 TM 10-3930-644-14 & P
Readings Too Low to Test
If all cells read less than 1.95 volts,
the battery is too low to test
properly. Failure of the meter to
register on all cells does not indicate
a defective battery. Boost-charge
battery and repeat the test. If the
battery is found to be good after
boosting,
it
should
be
fully
recharged for good performance.
Figure 1-5. Uniform Readings
Low Readings
If cells read both above and below
1.95 volts and the difference
between the highest and lowest cell
is less than .05 volt, the battery is
good, but requires charging (see
Figure 1-6).
Figure 1-8. Reading Too Low to Test
If none of the cells comes up to 1.95
volts after the first boost charge, the
battery should be given a second
boost.
Batteries which do not come up
after a second boost charge should
Figure 1-6. Low Readings
be replaced.
The procedure outlined below
Non-Uniform Readings
should be used on any battery
originally found to be good b' the
If any cell reads 1.95 volts or more
Light Load Test, but has since failed
and there is a difference of .05 volts
or more between the highest and
to perform satisfactorily in service
and which still tests good by the
lowest cell, one battery should be
Light Load Test.
replaced (see Figure 1-7).
c. Full Charge Hydrometer Test
(1) Use hydrometer Read accurately to
nearest scale division and correct
readings for temperature.
NOTE
Hydrometer readings taken
on,
partially
charged
batteries
are
unreliable for this test.
Figure 1-7. Non-Uniform Readings
(2) Record individual cell readings
unless all cells are fully charged
(1.255
specific
gravity
or
higher).
R-146-1
3-77
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