The model is 12.8V-55Ah LiFePO4 battery pack.with BMS, the dimension is L* W* H= 206* 138* 228mm.We use 4pcs of 3.2V/ 55Ah are in series to make it. You can count on me that our products have superior quality and competitive price This type is always used in electrical vehicles, such as ebike, escooters.golf-cart, and storage battery in solar-wind projects. the discharge rate is from 2C to 10C.