diymore 20PCS TP4056 Charging Module Type-C 5V 1A 18650 Lithium Battery Battery Charger Module Charging Board with Dual Protection Functions

works as described great value pack

Muy buenos

I only needed one of them for my needs. However, I had to buy 5 of them, but the price is great. No issues so far. I was able to charge my 18650 battery with this controller using an old solar panel from the LED motion detection panel (the solar panel produces about 10 VDC in full sunlight).

Its a good little board, definitely worth it

Good product used for repairs

A caveat before you read further: I'm an electronics hobbyist with *some* experience, but by no means an expert. I got these because I wanted use a Li-ion battery as a power source for an ESP32. My setup was 18650 cell > this charge controller > 5v boost converter > ESP32.It's been iffy from the start. The main IC on this does get HOT at the start of recharge. Other reviews say this is because it is a linear power converter and has to basically dump the excess wattage to bring the 5v USB input down to the correct charge voltage. I get that, but yeesh. It's too hot to touch at times. I don't feel super confident leaving this unattended.On the plus side, it did recharge my battery a couple times and nothing caught fire lol. Seems to start and stop at the correct voltages as expected. Then everything stopped working. Again, I'm not an expert, so all of this could be on me. TL;DR does it work? Yep. Is it ideal? Really not sure.

The only issue I've had so far was packaging - the devices were in a plastic bag rather than an antistatic bag. Not what I expected, but probably didn't do any harm. Hopefully they'll fix that in the future.

GOOD PRODUCT