Electrolyte in flooded lead-acid batteries is an acid solution. It will burn eyes and skin, and eat holes in clothing. When working around batteries, wear goggles, gloves, and old clothes. Keep baking soda at hand to neutralize acid spills, but never allow any of this alkaline solution to get into the battery. This will diminish the strength of the acid and reduce the battery’s capacity.
Gassing (bubbling) of hydrogen and oxygen is a normal occurrence, especially during final, or heavy, charging. This gas is potentially explosive, so keep sparks or flames away from batteries.
Batteries can produce thousands of amps if a direct short occurs. Be very careful when working with metal tools around battery terminals. If you do not feel competent to install or maintain your battery bank, do not hesitate to hire an experienced professional.