10pcs 5V 1A 18650 Lithium Battery Charging Board TP4056 Lithium Battery Charging Board Micro USB Charge Module with Protect

Work great for balancing batteries where the BMS can't do the job or where a cell is weak/damaged. I was able to get more time out of a damaged battery pack. Don't expect miracles--a bad cell eventually needs to be replaced.

I have read that HiLetgo products seem to be priced based on the possibility that a couple of them may not work, and maybe this is true, but I have not had that problem so they are a great deal. I converted a Coleman lantern to use two 18650s for power and have one of these charging them in parallel and it works great. Charge time is not fast, but I have about 15 hours of run time on my lantern and I don't have to buy D batteries anymore. I have plenty more 18650s and 9 more of these boards to make projects :)

These are rather nice boards designed to allow charging of small LiPo packs or cells for use in battery operated systems. It allows charging while in use, and can handle micro-USB connections or hard-wired 5V inputs on the external pads. I will note that the micro-USB connections on the board are reasonable, and have through-holes, but it's still quite possible to accidentally rip them off if you're not careful. I would advise using hot glue, or some similar non-conductive adhesive to help better hold it in place if you plan on using them for regular charging. This is common to many such surface mounted ports, but important to recognize. Happily this also exposes the raw terminals as solder-able mount points, so losing the port doesn't mean it's impossible to use if it does come off.

it is easy to solder on and it work well charges my 3.7v lion ion pretty fast would recommend just that it overheats a lot

They work as expected; all of them. Not difficult to use and excellent for my project

Worked fine to recharge lithium cells

These are as simple as it gets for charging 1S Lithium batteries. You will need to solder in power and charge leads - but the holes are near the edges of the board and easy to solder. Be careful to mount it somehow and protect it from anything toughing it. Its easy to short circuit the board if its not protected. I went though a few because I wasn't so careful....but they are really cheap and you get a lot of them! The board also gets a bit hot while charging - so mount with silicone or something heat resistant.

TL;DR: Don't use this for anything but 18650 LiPo cells. Everyone wants faster charge rates and all that. But please pay attention people: If a LiPo cell catches fire, NOBODY CAN PUT IT OUT. Be safe and charge the cells on a fire-resistant surface such as a metal dust pan so that you can take it outside if it catches fire. Also, I recommend charging this in a place away from your house. The resistor at the PROG pin (pin 2 of the TP4058 chip) is 1.2 k ohm. It is not suitable for charging smaller cells such as 13400 series LiPo cells that one may extract from a used vape. For smaller cells, this resistor should be greater (5 k to 10 k ohm). If you have the tools, I suggest replacing R3 with a 2 k ohm resistor for 18650 batteries or a 10 k ohm resistor for 13400 series batteries. If you don't have that, at least run this thing with a current-limited 5 volt supply. Get an old, cheap USB supply that only puts out 500 mA or so, and use that for your 5 Volt source. Aside of the risk of battery fires, this board may shorten the life of the cell. You CAN charge a smaller cell at greater rate than 0.2C (C being the mAH rating of the cell). But you will likely reduce the number of charge/discharge cycles of the cell to less than half of what it may have been specified for. Be Safe! Jacob Brodsky, PE Amateur Radio Station AB3A