TM10-3930-660-20 8-43. BATTERIES   - SERVICE/TEST/REPLACE (Cont’d) WARNING Always check the electrolyte level with the engine stopped. Do not smoke when checking the battery. Do not use an exposed flame to check battery levels. Protect the eyes when checking the battery level. Do not overfill batteries so that water splashes acid from cell openings. Battery acid can cause skin irritations or burns. 1. REMOVE BATTERY BOX COVER (1). a. Remove two straps (2) securing battery box cover (1) to battery box (3). b. Lift and remove battery box cover (1) from battery box (3). 2. IF NECESSARY, ADD DISTILLED WATER TO CELLS OF BATTERIES (4) AND (5). a. Remove fill plugs (6) from batteries (4) and (5). b. Fill each cell to top of ledge in filler neck with distilled water. c. Install fill plugs (6). 3. CLEAN EXTERIOR SURFACE AND TERMINALS OF a. b. BATTERIES (4) AND (5). Remove cables from batteries (4) and (5) as described in REMOVAL section of this paragraph. Remove batteries (4) and (5) from vehicle as described in REMOVAL section of this paragraph. 8-108