BATTERY TESTING INSTRUCTIONS

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Preparation-cont.

TM-5-1940-277-20 Boat Bridge Erection Twin Jet Aluminum Hull MODEL USCSBMK1 (1940-01-105-5728) MODEL USCSBMK2 (1940-01-218-9165) Manual

TEST: Using Optical Battery Tester

TM 5-1940-277-20

TM 1940-20/2

3-88. BATTERY TESTING INSTRUCTIONS

TOOLS: Optical Antifreeze/Battery Tester

10 mm Box Wrench

PARTS/MATERIALS: Distilled Water

Rags

REFERENCE: TM 9-6140-200-14 for care and maintenance of lead-acid batteries.

TEST: Using Optical Battery Tester

Battery gases can explode. Do not smoke, have open flames, or make sparks around

batteries. Batteries always vent gases. Battery can explode and cause injury.

Electrolyte (battery fluid) and battery corrosion can cause injury to you. Wear safety

goggles and gloves. Flush clothing and skin with clear water if electrolyte or battery

corrosion is contracted. See a doctor if on face or in eye.

NOTE

Correct electrolyte level is at bottom of vent plug holes (filler caps). The electrolyte must

be between top of plates and bottom of vent plug hole for this test. Do not overfill the bat-

tery.

NOTE

The 6TN and 6TL batteries can be mixed or matched. However, maintenance-free bat-

teries cannot be mixed or matched with military batteries. The 6TN and/or the 6TL batter-

ies will perform properly in hot weather as long as electrolyte levels are carefully moni-

tored. If the electrolyte expands and causes the level to rise, some fluid must be

removed. If the level becomes too low due to evaporation, distilled water may be used

to obtain the proper level. A good grade of drinking water (excluding mineral waters) may

be used if distilled water is not available.

Electrolyte (NSNs 6810-00-249-9354 and 6810-00-843-1640) have a specific gravity

of 1.280 and should be used in these batteries. Do NOT adjust the electrolyte in wet

batteries to a lower specific gravity.

Open and secure battery hatch (refer to paragraph 3-154).

Remove battery box cover (refer to paragraph 3-89, steps 2 and 3).

Remove caps from each battery cell.

NOTE

Check battery tester each time it is used for proper operation. To check, put several

drops of clean water on window and check the shaded area through eyepiece. Window

must be tight for correct reading. Tester is ok, if shading begins at +30 to +34F. Dry

the window after check.

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