Batteries wet filled with acid what is needed?

To properly wet-fill a lead-acid battery with electrolyte, you need a battery acid solution, typically a mixture of sulfuric acid and distilled water. Safety gear, including gloves and goggles, is essential to protect against the corrosive properties of the acid. Additionally, a funnel or a pouring device may be required to avoid spills while filling the battery cells to the recommended level. Always follow the manufacturer's guidelines for filling and handling the battery.