LEOCH 12 Volt Ultra High Rate Sealed AGM Battery - XP12-210 (12 Volt 55AH) battery is a non-spillable state of the art design battery. There is no need to add electrolyte or water, as gases generated during charging are recombined in a unique "oxygen cycle". This battery can be operated in any position, and can be used in close proximity to people and sensitive equipment. When an AGM battery is charged no hazardous fumes escape the battery case, gases are processed within the battery itself.