<h4>If the battery has removable vent caps, check the electrolyte (battery fluid) level in each cell. If required, add distilled* water to bring the fluid level to just below the filler tube. CHARGE THE BATTERY PRIOR TO TOPPING UP THE ELECTROLYTE, otherwise electrolyte expansion during the charging process could cause the fluid to overflow. <em>*Using regular tap water may introduce contaminants that could cause internal corrosion and premature battery failure.</em></h4>