Features: 7.4v 5200mAh rechargeable battery. Continue working for 2 hours on a single 10-hour charge. Easily change your old battery for your bait boat(not included). Convenient to recharge. Specification: Battery Capacity: 5200mAh / 9600mAh (optional) 5200mAh: Working Voltage: 7.4 V Working time: approx. 2 hours Charging Voltage: 8.4V Charging time: approx. 10 hours Type: 18650 Size: 69 * 40 * 40 mm / 2.7 * 1.6 * 1.6 in Weight: approx. 191 g / 6.7 oz 9600mAh: Working Voltage: 7.4 V Working time: approx. 4 hours Charging Voltage: 8.4V Charging time: approx. 10 hours Type: 21700 Size: 73 * 42.7 * 42.7 mm / 2.9 * 1.7 * 1.7 in Weight: approx. 289 g / 10.2 oz Package List: 1* Battery NOTE: This battery is not suitable others bait boats.