KOOBOOK 10pcs 3A BMS Protection Board with Solder Belt for 1S 3.7V 18650 Li-ion Lithium Battery Cell Kit

Listed exactly what I wanted it to do and would recommend to anybody. I was using it to build my own battery pack for items while on the go and it worked perfectly so that there was no overcharging happening on the 18650 batteries.

Used these to make a small battery pack for an electronics project, and so far it has not burned down my house. It does work - both charging and discharging. I have not tested it a ton, but good experience so far. I guess don't be worried that the charge / discharge specs are via an image that uses comic sans. But maybe still do? If your house burns down I am not liable. Your experience may vary. But yeah I like it so far.

Great Job. I don't understand people saying that there is no "output" and they have to use the battery tabs. That's incorrect. The P+ and P- are the outputs -- solder your wires to those and you are BMS 'protected'. Lay down a couple of layers of kapton on the battery, a strip of G10 would be a nice addition, and weld the strips to the battery (component side down).

I received my package, opened it up and found all the protection boards were mounted under one board side by side. they had cutouts in between each device so I had to use a wire cutter to separated one. Just a cut a each end. Soldering on the tabs was the easiest thing. Next I connected a fully charged a 3.7 Lithium, 1700mah battery that I fully charged for the testing. I began really easy on it since I wanted so create an a base line. started the test at 500mah, about 20minutes later there was no indication of thermal runaway. everything looked normal. stopped the test and pushed to 1amp, once again everything looked ok, next I pushed up to 1.5amp load.. Nice. I then set the 2amp load when I began to see a voltage drop, after about 5 minutes I noticed the little chips were getting hot. At a room temperature of 75 degree farenheight, they felt slightly hot to the touch. So that is where I drew my lineI. 2amps and no more. why? well if you install it on a battery that will be exposed to very high temperatures, who knows how long this little device will last. I live on desert land, I see several months of over 110degree weather in the summer. Imagine your project under the sunlight while its generating its own heat? Now there is the other item. The voltage drop during the testing. there was a voltage differential between the battery contacts and the output contacts. Something to be aware of. Long story short. I tested the cut-off voltage. This board sample, cut the battery off at exactly 2.82volts measured at the battery and at its output contacts the voltage was 2.49 volts. I just wanted to mention that point. It did its job of disconecting the battery a 2.82V but its output under two amp load was 2.49volts at that exact time. I did not push past the 2amps. I think that its the real life usable limit of this boards.

I build garden lights. These are essential to not over-charge the lithium cells. Small and perfect for my use. The tabs spot-weld very nicely!

I needed this component to repair my CPAP cleaner. I was able to install 3.7 volt rechargeable battery, worked perfectly.

Had one DOA after a week. Been using a second one for a few months without issue. These may be of questionable reliability.

funciono bien

Only thing I'm not sure of is. . . If I have 2 boards installed on two seperate 3.7V batteries, can I place those batteries in series and still be protected and have an output of 7.4V??

En un excelente producto para proteger las baterías

Me encantó la calidad