Lock, use to lock the battery on the frame and turn off and on. Charge Fuse:Charge protection. Battery level light:Press the button the light will turn on. 1 Red 2 Green—100%. 1 Red 1 Green—50%. 1 Red 0 Green—20%. Discharge socket:Please use our discharge cable connect to your controller. Lf you do not use our cable, please ensure your cable “+” and “-” is same as our battery. The fuse will break when the discharge is more than 30 amperes. In order to better protect the battery. This plate will be installed on the battery. You can take it off by the key and install it on the. Bike frame by screw. Then put the battery on it. BMS Protection Board? High quality imported electric cell and equipped with a BMS protective plate, prevent over charge, over discharge, over current and short circuit and ensure the long life expectancy. Avoid extreme high and low temperatures when using or storing lithium-ion batteries; Pay attention to vibration and avoid falling and collision; Avoid excessive charging and discharging; Use the original battery charger; If long-term storage, discharge the lithium-ion battery to about 40% and leave it Store in a cool and dry place. Our battery can fit for most motor kit, for example: Bafang, Voilamart, Tongsheng. But exclude these four : BOSCH, SHIMANO, YAMAHA? CC/CV (Constant Current; Constant Voltage). 80% after 1000 Cycles. Use only the provided or recommended charger. Avoid extreme temperatures and water exposure. Store in a cool, dry place when not in use. According to the accompanying user manual, use this battery correctly and safely. 36V 13AH/17.5AH Silverfish. Ebike Li-Ion Battery for 36V 250w 350W 450W 500W Electric Bike Motor. Battery cell:A grade 2600mAh Cell. Maximum continuous charge current: 20A(BMS). Peak Discharge Current: 60A. Charge Cut-off Voltage: 42V. Discharge Cut-off Voltage:2830V. Charging time:7 hours. Fit for Motor Power : 36v 50W- 500W. Discharge connector :Bullet head Connector. Battery weight:3.5KG. Battery Capacity: 17.5Ah. Battery weight:3.75KG. 1Ebike Battery with Discharge Plug(2-PIN). The battery must be FULLY charged before first use. The battery is stored in a cool and dry place. Do not Separation, extrusion, and impact. Do not put battery into water and fire. Keep away from children. Warhouse: United Kingdom/ Germany. We offer 30-day return&replacement. Thank you so much. Our working time:Monday- Friday, 9:00 to 18:00.