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

Really useful board for electronics projects

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.

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?

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

Muy buenos

This only works with either a USB a to c cable or on non compliant chargers. The majority of my chargers won't supply power to it.

Not much to say about these except that they are as described. The price is as good as I could find elsewhere. I am using these to charge 18650 cells for a hobby project, wiring them directly to a 5V rail (skipping the USB connector).