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Compatibility: Compatible with 3.7V 18650 batteries, supporting DIY devices, power supply, etc. Build in 4056 chip to prevent the battery voltages from exceeding 4.2V (upper charging limit) or dropping belows 2.5V (lower discharging limit). Overcurrent Protection: Limits charging and discharging currents, preventing short circuits, overloads, and potential battery damage. Bidirectional Type-C: Supports charging the battery via USB Type-C or reverse powering other devices efficiently. Wide Application: Boosts 3.7V battery voltage to 5V output, compatible with standard USB charging or power banks.