Parts Unlimited has made a premium-quality, maintenance-free battery at a low price. Get up to three times longer battery life than conventional batteries. Don't worry about water loss. When filled with acid the absorbed-glass mat battery permanently seals.; Battery seals to prevent water loss Acid pack included Holds a charge up to three times longer than conventional batteries Dimensions: 6-13/16" L x 3-3/8" W x 6-1/8" H Amp hours: 18