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 TM 55-1905-242-14
0092 00
TESTING (continued)
EXAMPLE 1
The battery electrolyte temperature reading is 60 degrees Fahrenheit and the hydrom-
eter shows a specific gravity of 1.240. Since 60 degrees is two 10's below 80 degrees
Fahrenheit, you must subtract two 4's or eight specific gravity units (0.008) from the
hydrometer reading. This leaves a corrected specific gravity reading of 1.232.
EXAMPLE 2
The battery electrolyte temperature is down to 20 degrees Fahrenheit and the hydrom-
eter shows a specific gravity of 1.256. Subtract 20 from 80 to get 6 10's difference,
therefore, 6 4's (0.024) must be subtracted from 1.256. This gives a corrected specific
gravity of 1.232.
EXAMPLE 3
The battery electrolyte temperature reading is 100 degrees Fahrenheit and the hydrom-
eter specific gravity reading is 1.224. The electrolyte temperature is two 10's above 80
degrees Fahrenheit. You must add two 4's or eight specific gravity units (0.008) to the
original float reading to get a corrected specific gravity reading of 1.232.
11. A fully charged battery should have a specific gravity (adjusted to 80 degrees Fahrenheit) of 1.260 to 1.270. If the
adjusted specific gravity is below 1.225, charge the battery.
12. After charging, again check each cell of the battery as described above. Each cell must be within 0.025 specific gravity
of all the other cells. If a greater difference exists between any two cells, the battery is defective. Replace the battery.
13. After using tester, flush it with clean, clear water.
14. Install the battery caps (1).
REMOVAL
WARNING
Take great care when working around energized electrical equipment. Contact between
unprotected body parts and electrical conductors can cause serious injury or death. Do
not wear jewelry or other conductive items while servicing energized electrical equip-
ment. Failure to comply can cause serious injury or death.
1.
If not already on, don chemical protective gloves, apron and goggles.
2.
Disconnect and remove the negative lead (2) from one battery bank.
3.
Disconnect and remove the positive lead (3) from the same battery bank.
4.
Disconnect and remove the connector cable (4) from the same battery bank.
0092 00-3
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