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

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.

These are your normal tp4056, just with a type c port. One thing to note, these will not work with type c power delivery only chargers. They lack the 5.1k resistor needed to trigger 5v. Other than that they're great.

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 have several E35 18650 batteries, each with a charge/discharge controller attached and the outputs tied together to create a larger battery capacity. Everything seems to work OK, except when batteries discharge to low threshold and charge power is connected and the green/red LEDs then blink back and forth and do not appear to charge. If I remove all but 1 battery, it charges OK and reinsert others above 3.5 V and all will then charge up to 4.2 V cutoff. What is the issue with charging batteries just above low voltage cutoff?

Muy buenos

E probado algunas de ellas y an funcionado bien, creo es un producto muy práctico

I've purchased 50 of these boards, and use them to charge 32 repurposed 18650s at a time for a 60 kwh home battery that I'm building. So far, after charging around 1000 cells, 20% of the boards have failed. A few were my fault (they are kinda delicate), but the rest have died in a variety of ways - all manufacturing issues, as far as I know. They are super cheap, and I bought extras in anticipation of possible problems, but I'm looking for alternative solutions.

Small and fierce. I hooked up 2-18650 in parallel to see how it help up. It got pretty warm but charged them in 2 hours to 4.18v. they started at 2.45v put a cooling fan next to it and did it again. Performed great. I will be charging one at a time from now on but knowing what they can do is good with me. I wouldn't suggest you using them other than the recommended way.