1. Technical parameters: Size: Total length: 430MM width: 100MM thickness: 46MM Battery weight: about 3KG Capacity; 12.8AH, Nominal voltage: 47V-54V Standard charging method: lithium battery is memoryless and maintenance-free, and can be recharged as needed 2. This product is covered by picc, please rest assured to use it. 3. Note: (1) Please use a special charger for charging; (2) Do not reverse the positive and negative poles; (3) There are safety devices in the battery pack. To ensure safety, do not dissect or change the structure of the battery; (4) It is forbidden to use metal to directly connect the positive and negative poles to short circuit; (5) It is strictly forbidden to immerse the battery in water. When it is not used, it should be placed in a cool and dry environment; (6) Dear buyer, please understand the battery-related dimensions of your electric vehicle before shooting. If the dimensions do not match our baby's description, please contact customer service to customize the size more suitable for you, thank you! (7) If the battery pack is not used for two months, leave the battery pack fully charged, and charge the battery pack before use.