Figure 2-9. Battery Discharge Equalization Fixture (Typical Setup).

TM 116140203141

Figure 2-9. Battery Discharge Equalization Fixture (Typical Setup).

at the end of charge (approximately 130°F).

1979 will not break down in the alkaline environment

(2) When the constant potential charging method

of the cell as did cellophane, and therefore thermal

is used, the current gradually increases rather than

runaway is much less likely with these materials. How-

gradually decreases.

ever, even with these new improved plastic materials,

(3) If the constant current charging method is

overheating and spewing of electrolyte can occur if ex-

cessively high potentials and temperatures are en-

used, runaway will be indicated by a decrease of bat-

countered.

tery voltage with time rather than an increase as is

usual.

d. Detecting Thermal Runaway. Thermal runaway

may occur if the batteries are charged for long periods

216. Extreme Temperature Operation

at high charging voltages or high temperatures.

The nickel-cadmium battery displays a much greater

Thermal runaway may be detected by the following

low temperature operation capability than the lead-

signs

acid battery. Usually, design specifications list the

(1) Battery temperature shows a significant rise