Small volume, high power, high efficiency, complete protocols, mainstream open protocols are basically supported. Module for 3.7V lithium batteries, including polymer, 18650, 21700 lithium batteries. Ensure that the battery is not aging, the battery can be connected in parallel and not in series. Module size is relatively small, the heat dissipation area is limited, high-power output heat is a normal phenomenon. With automatic load detection / light load detection, support for digital display. With output overcurrent/short circuit protection, charging timeout/overvoltage protection.