15pcs 5V 1A TP4056 Charging Module Type-C USB 18650 Lithium Battery Charger Board with Protection (Type-C USB)

I have built these Li-Ion battery charger in over a dozen projects so far. They ranged from 1200 mAh to 40 mAh batteries. To accommodate the different battery capacities, I unsoldered the surface mount resistor that sets the charging current and replaced it with one appropriate to the battery size. These chargers stop the charge reliably at the required 4.2 V, which is important for battery life. At first, having the charge LEDs mounted on the board was a problem, but now I just drill a small hole in the enclosure near the LEDs and put frosted Scotch tape on the inside of the hole. The light shows up even off axis. With a small battery, the "off" drain on the battery is important. These had a drain in the low microamps, which is great. They are a great way to incorporate USB-charged batteries into projects and a great price as well.

I used 4 of them in projects.. already 2 stopped working. It doesn't charge.

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Ok excellent

I haven't checked all of them but the ones I have used so far work perfectly, great for small projects that require a small charging board and a single battery or a 1SxP setup.