TP4056 Li-ion Charger

The TP4056 module is a highly integrated, standalone linear charger for single-cell 3.7V lithium-ion or Li-Po batteries, such as the popular 18650 format. It operates from a standard 5V USB input (Micro USB or Type-C) and delivers a precise constant-current/constant-voltage charge profile up to 1A, automatically terminating when the charge current drops to 1/10th of the set value. Key features include an internal PMOS architecture that eliminates the need for an external blocking diode, thermal regulation to prevent overheating during high-power charging, and an LED indicator for charge status. This module is perfect for hobbyists and engineers building portable devices, custom battery packs, or charging stations. Its compact design and ease of use make it a go-to solution for reliable and safe Li-ion charging in various DIY and prototyping projects.