ACDelco ATZ12SBS Specialty AGM Powersports JIS 12S-BS Battery This battery is shipped dry with separate acid pack and requires an initial charge before instillation which gives the product a very long shelf life Convenient acid bottle for the correct amount of acid for the battery, no left over acid to be disposed Absorbed Glass Mat design makes the battery spill-proof and eliminates water loss Once vent caps are installed this is a sealed maintenance free battery Maintenance Free - No liquid required once the battery is sealed