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)

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.

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

Great lil board for power delivery and battery 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.

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.

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!

These get HOT! I used these for a small project I was making and the end result was decent. These modules do their job, but they get very hot while charging. I pointed a small fan at them while they charged because I was concerned about the heat. For the price, they were good. Installation was super easy. But I’m not sure about the overall longevity of these.

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.