Battery Electrolyte Specific Gravity Test.

TM 9-6140-200-14

7. Charge each battery being placed into service. Charge battery at an

ampere rate of 3 to 5 amperes (2HN, 4HN and 6TN types) and the

charging rate of 5 amperes or 15 volts constant potential voltage to the

6TL.

8. During the charging process, maintain the electrolyte temperature at

maximum of 130 degrees Fahrenheit by charging the charging the battery

at a normal rate. Reduce the charging rate if the temperature increases.

if necessary, disconnect the hot battery from the charger or turn off the

charger until the battery is cooled.

4-11. Battery Electrolyte Specific Gravity Test.

This test is used to determine the approximate state of charge and how much energy is

available from the battery.

WARNING

Battery electrolyte is an acid. Severe burns may result.

Take precautions to avoid contact with eyes or skin.

Figure 4-5

a. Use an hydrometer and draw enough fluid from battery cell to allow indicator

to float freely (see Figure 4-5).

4-18