BATTERIES -706880493

TM 5-4210-233-14&P-1

4-114. BATTERIES

This task covers:

a. Test

c. Installation

b. Removal

TOOLS REQUIRED:

PERSONNEL REQUIRED: 2

Tool Kit, General Mechanics, Automotive

(Appendix B, Section Ill, Item 1)

EQUIPMENT CONDITION

Hydrometer (Appendix B, Section Ill, Item 7)

Main Engine Shutdown (see para 2-12.)

APU Shutdown (see para 2-16.)

a. Test.

WARNING

Batteries contain sulfuric acid. They may also

contain explosive mixtures of hydrogen and oxygen

gases in each cell at all times. To avoid serious

injury, always wear face shield, goggles, safety

shoes, gloves and protective clothing when working

with batteries.

Keep sparks, flames, burning

cigarettes or other ignition sources away at all

times.

Do the following steps for each cell:

NOTE

Never take hydrometer reading immediately after

water is added to cell. Water must be mixed com-

pletely with electrolyte, by charging, before

hydrometer readings are reliable.

Make sure hydrometer barrel and float are not

cracked and that float is clean. Draw in and expel

electrolyte in hydrometer several times to bring

hydrometer float and barrel to same temperature as

electrolyte.

(1) Remove filler caps from battery.

(2) Draw electrolyte into hydrometer until bulb

is fully expanded and float Iifts free. Float

shouId not touch side, top or bottom

stopper of barrel.

(3) Hold hydrometer with surface of liquid in

barrel at eye level. Disregard curvature of

liquid at float stem and barrel. Read

specific gravity on float scale.

(4) Compare reading to following table. Fully

charged specific gravity of 1.265 corrected

to 80 (26.7 ) is assumed.

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