Tuttio Soleil01 Electric Bike Battery【Automotive Grade Chip Batteries】-48V 21AH Batteries provide up to 43Miles/70KM of range with 31% more capacity for an additional 16% more range than other models on the market. The UL battery, verified by Rheinland Labs, includes BMS safety protection for high temperature resistance and stable battery life, while the battery's thermal management system, TMS, controls high temperatures during charging and ensures safety and fast charging in 7-8 hours.