JacobsParts Smallest USB Type C 3.7V Lithium Battery Charger Board 4.2V Charging Module with Protection Circuit and LED Charge Indicators 5V USB-C Input (2 Pack)

Although one of the connectors had a defective problem, it was quickly replaced. When compared with vast majority similar competitive products, this particular unit is vastly superior from my experience. It is smaller and allows for secure precision mounting ... especially in 3d print configuration. It also has components mounted in from edge allowing for gripping of edges or use in really tight configurations. Itd indicator LED is near enough the connector with the brightness enough that no particular considerations are needed. My future design projects WILL include these modules! DEFINATELY RECOMMENDED!

When you buy these, make sure you understand how this works. It charges batteries but you can't draw power from the USB-C charging port. There are other small charging boards that can do both! Just search here at Amazon.

This board is working well for me and the size is perfect for my LED flashlight project.

Soldered wire to magnets, making sure to put magnets on larger magnets first to maintain magnetism (heat will destroy/mix it up). Worked fine. One important thing to know, the lights. A solid red means you're charging.

Good value. Did exactly what I needed. But they only charge to 4.1 Volts. All ten of my samples were identical. No problem for my application. Would buy again.

Such a great mini 3.7v litiun charger, although it heats up a little when using 1.5 Ahm charger, but they work great. Thank you and recommended.

Muy bueno

The other guy is correct and in my case 'no load voltage' is only 3.9V. I tried to charge 190 mAh 3.7V and it just never went to full charge after hours of charging.