Battery Maintenance - TM-10-3930-609-120060

TM 10-3930-609-12

ME 3930-609-12/3-15

Figure 3-15. Horn button.

(1) Put battery on charge again at the

finish rate, so cells gas for thorough mixing of

electrolyte.

Note. Never make a gravity adjustment on a cell

which does not gas freely on charge.

(2) Draw off electrolyte down to splash

cover from low reading cells. Slowly pour elec-

trolyte of 1.300 to 1.350 specific gravity in cell

to high lever (1/4 inch below filler neck).

Caution: Never use acid or higher speci-

fic gravity than 1.350.

(3) Wait twenty minutes for added electro-

ME 3930-609-12/3-14

lyte to become thoroughly mixed by gassing

charge and then read specific gravities. If the

Figure 3-14. Horn.

gravity of any cell is still below normal repeat

steps (1) through (3). Repeat as many times as

lyte at normal level and cells fully charged

necessary.

should be 1.265 to 1.285. This specific gravity

(4) Continue charging battery for one hour

is correct when the battery is delivered and will

at the finishing rate, after gravity has been ad-

not require adjusting during the lift of the bat-

justed.

tery unless electrolyte is actually lost out of the

(5) If the corrected specific gravity of any

battery.

cell is higher than normal (1.285) proceed as

follows:

b. Adjusting Specific Gravity. Acid or electro-

(6) As the battery charges, withdraw from

lyte should never be added to a cell without first

the cell a small amount of electrolyte and re-

being sure that charging will not restore the

place with water. Repeat at 20 minute intervals,

gravity. Give the battery a thorough equalizing

if necessary, until a 1.285 specific gravity reading

charge (para 3-46e). Charge should be con-

is obtained.

tinued until specific gravity when tested every

hour for three hours shows no further rise at

c. Adding Water to Battery. Add only dis-

any cell. If, after charge, gravity is still below

tilled water or chemically analyzed and approved

normal proceed as follows:

water from public drinking source. The proper

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