... and/or BMS built inside to balance protect the battery.b. Long life-cycle: Can be circularly used, ... to 2000 times recycles, 8 times of lead acid battery. c. Lighter weight, with the best power-to-weight ratio ... : 1/3 of Lead acid battery weight.d. Good performance at high temperature and ... preference.Any question, please contact Coco Guo for help! 24V40AH Lithium battery for wheelchair