Lithuim battery with BMS Lithium Battery. Made with the high quality cells: 12 Ah : 2900 M/ah Samsung Cells; 17.5 Ah: 3500 M/ah Samsung cells Capacities: 12 Ah or 17.5 Ah; There are 4-pin, 5-pin discharge sockets to choose from. Application:Electric bike/Electric bicycle for 350W-1500W Motor Light weight design, easy to install and remove; Eco friendly and safe to use With BMS System,Charger, Connector Plug High Quality 100% test every battery, Cycle life:800-1000 Times. Warranty:1 years, Certificate:CE/ROSH/MSDS/UN38.3 package list : 1 * eBike Battery 1 * Charger( US/ EU/ AU / UK Option ) 1 *bottom plate 2 * keys.syi