Dominator gel batteries offer many significant advantages over conventional liquid acid batteries. Gelled electrolyte cannot sulfate like a liquid acid battery, and since there is no liquid, there is no need to check fluid levels. Construction also eliminates vibration damage to plates, a common problem with flooded batteries. Even works under water. 100% maintenance free, faster recharging, self discharge rate of less than 1% per month (at 68°F), resists damaging over discharges. All batteries carry a 1 year pro rated warranty. 20 3/4" x 11" x 10".