TM10-3930-660-20 8-43. BATTERIES -  SERVICE/TEST/REPLACE This task covers: a. Service b. Removal c. Installation d. Testing Initial Setup Tools Materials/Parts Tool Kit, Auto Mechanics Distilled Water (App. C, Item 55) Soda Solution (App. C, Item 46) Wire Brush Petroleum Jelly (App. C, Item 15) Equipment  Condition Vehicle parked on level ground. Do not smoke or allow flame or sparks in the vicinity while servicing, removing, or installing batteries. Batteries generate hydrogen, a highly explosive gas. Severe personal injury could  result. To avoid sparks when removing battery cables, always begin by removing the negative battery cable first. WARNING Batteries are filled with acid electrolyte solution. Always wear protective clothing, rubber gloves, and eye protection when servicing removing or installing batteries. 8-107