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
4-18