ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
(1) Inspect. Remove battery cover by turning quarter turn studs (2, Figure 3-6) and visually inspect batteries for obvious
damage, such as cracked or broken case or covert, or leakage of battery acid.
Remove the vent caps on top of the battery, one at a time, and check the electrolyte level. If the metallic
plates are visible above the fluid level, service in accordance with step (3), below.
Test the specific gravity of the electrolyte with a hydrometer. The specific gravity shall be 1.265 :0.010. A
hydrometer reading of 1.150 or less will allow the battery to freeze at -550 (-48°). With a specific gravity of
1.280 the battery will withstand temperatures as low as -65°F (-54°C) without freezing. A battery with a
specific gravity of less than 1.150 at -25°F (-31°C) should be charged or replaced.
If the battery has passed the tests, Install the cover in accordance with step (5)(e) through (h), below.
Figure 3-5. Batteries and Related Parts (Sheet 2 of 2)
(3) Service. Service the batteries at the intervals shown In the Operator Preventive Maintenance Checks and Services,
If the electrolyte level In the batteries was seen to be low In step (2)(a), above, fill with distilled water to 3/8
inch (9 5 mm) above the plates.
Replace vent caps as soon as servicing is completed.
(4) Install and Charge If the batteries are shipped dry, add electrolyte prior to installation.
Electrolyte contains sulfuric acid which can cause severe burns and injury to personnel.
It is highly toxic to the skin, eyes, and respiratory tract. Skin, eye, and respiratory
protection is required to avoid injury to personnel.