Leading Quality Cells. We only source high quality A-grade cells from. Official sources (never use fake or cheap cell pack sell at lowest price to attract buyers). Design and assemble all batteries in our own factory. Each pack is ran through a full charge and discharge test before leaving our facility to make sure you are getting every amp hour you paid for. Built-in Battery Protection System. Each Battery is fully automatic built in battery protection system (BMS). Prevent the battery from overcharging, overdischarging, and short circuit. We don’t take chances when it comes to our batteries or your safety! Battery have problem, we will give you good solution. Order over 3 month we can provide free repair service. We have repair center in UK. Free Return Service. Surge of power, let your electric bike fly freely. Design for a group of young people who travel with new ideas to provide strong power to make the journey run farther. (Suitable for do-it-yourself retrofitting to enhance the mode of the bike). 1:To full charge the battery, please turn on the battery while charging. 2:ON/OFF Switch: “o” is power off, “-” is power on. 3:If the output connector also does not match your controller, you need to replace the connector (our package is equipped with male and female connector). 48V 20Ah LG Cell. Max Continuous Charge Current: 5A Max Constant Discharge Current:45A(BMS) Peak Discharge Current: 135A Charge Cut-off Voltage : 54.6V Discharge Cut-off Voltage : 36.4V39V Battery Dimensions : 36011090mm (14.564.333.54inch) Battery Weight: 4.84Kg (10.67 lbs) WIth Charger : 54.6V 3A. 52V 20Ah LG Cell. Max Continuous Charge Current: 5A Max Constant Discharge Current:40A(BMS) Peak Discharge Current: 120A Charge Cut-off Voltage : 58.8V Discharge Cut-off Voltage : 39.2V42V Battery Dimensions : 36012790mm (14.5653.54inch) Battery Weight: 5.32Kg (11.73 lbs) WIth Charger : 58.8V 2A. Or leave a note.