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

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

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.

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 was getting tired of using disposable batteries for my hobby electronics, so I purchased these along with some lithium batteries to solder onto them. At first I was having some trouble getting them to work, but then I figured out that it won't work if your cord sends more than around 5 volts, so try to make sure you use cords connected to a USB A port since those are limited at that voltage. Super handy being able to just recharge my batteries with USB C, highly recommend.

Muy buenos

I've used two of these so far from a set of 15. One worked, one didn't. The bad one displays both the red "Charging" LED and the blue (not green as the site says) "Charged" LED displaying at the same time and no current delivered to discharged cell. The good one works exactly as expected.Have not done anything with the other thirteen so far. I'm giving the vendor the benefit of the doubt and assuming that this was the only defective one, but will be certain to test the rest on a breadboard before building them into anything.