Pieces USB C Li-ion Lithium Charging Module 1A 3.7V with Protection 18650 Battery Charger Module

✔High-efficiency charging protection: The 4057 chip supports constant current/voltage charging, a maximum charging current of 1A, and overheat protection for safe and efficient charging. ✔Compatible with various lithium batteries: Compatible with 3.7V single-cell lithium batteries (e.g., 18650, polymer batteries, etc.) with a 4.2V charge cutoff voltage. Suitable for all types of 3.7V lithium batteries for reliable power to your devices. ✔Reverse polarity and over-discharge protection: Reverse polarity protection prevents damage caused by incorrect battery connection. Built-in over-discharge (2.4V) and overcharge (4.2V) protections ensure comprehensive battery protection. ✔Parallel connection restriction: Only parallel connection is possible; Avoid series connection ✔Package contents: 5 TP4057 1A lithium battery charge protection boards (with protection)