If the battery defects is proved in manufactruing process rather than the user by use of abuse and error caused. Our company is responsible for the replacement battery. 2? Prohibited matters 1Never make short circuit cell It generates very high current which causes heating of the cells and may cause electrolyte leakage, gassing or explosion that are very dangerous. 2Mechanical shock Falling, hitting, bending, etc. May cause degradation of LI characteristics. 3Prohibition of dumping of cells into fire Never incinerate nor disponse the cells in fire. These may cause explosion of the cells, which is very dangerous and is prohibited. 4Prohibition of cells immersion into liquid such as water The cells shall never be soaked with liquids such as water, seawater, drinks such as soft drinks, juices, coffee or others. 5Prohibition of disassembly 6prohibition of use of damaged cells 3? Battery Storage Conditions The battery is stored at room temperature with at least 40% to 50% remaining. We recommend to recharge the battery every 3 months to prevent over-discharge. Cannot be recharged after being stored for a long time, even if the charging method is correct, it indicates that the battery needs to be replaced. Main product: BAFANG/Tongsheng Motor Kits& Electric Bike&Battery. All the items we sell are authorized. Welcome and enjoy shopping. Enjoy the fun of DIY Ebike. Service within 30days after you receive goods. We provide repair services in North America/Europe. We will take all the responsibilities and solve all the problems for you asap. Bafang Electric Bike BBS01 BBS02 BBSHD Mid Drive Motor 500C Color LED Display. 1T4 E-Bus Wiring Harness Cable For Mid Drive Bafang Motor BBS01 BBS02 BBSHD Kits. Thumb Throttle for Bafang 8Fun BBS01 BBS02 BBSHD Mid Drive Motor Electric Bike. 2PCS Mechanical /Hydraulic Brake Sensor Power Cut Off Cable for BAFANG Mid Motor. Bafang 8fun BBS01 BBS02 BBSHD Mid Motor Gear shift Sensor for Electric Bike Kit. 2Pc Mechanical / Hydraulic Brake Sensor Cut Off Power Cable for BAFANG Mid Motor.