ML18-12LI is a 12V 18Ah Lithium iron phosphate sealed . rechargeable and maintenance free battery. Direct drop in lead acid replacement - Pack of 2 Dimensions 7.13 inches x 3.00 inches x 6.50 inches. Terminal: Internal Thread. Listing is for the battery and screws only. No wire harness or mounting accessories included. Stronger . Lighter and Longer 2500 cycle life expectancy compared to the traditional sealed lead acid batteries. Designed for safety with built in Battery protection BMS. BMS provides high voltage protection . low voltage protection . over high current protection . high temperature protection . short circuit protection . and over charge protection. Designed to be used in parallel with a maximum of 4 identical batteries. Do not connect in series. Make sure to only use a compatible lithium charger for this battery. Having loose terminals will cause a buildup of heat resulting in damage to the battery. Backed by a 30 day refund policy and 2 year warranty.