2Pcs 3S 11.1V 12V 12.6V 40A with Balance 18650 Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor Motorcycle Battery

Product as described

I've had problems with some BMS 3s. These work perfectly. I don't use them at more than a few amps. So the 60Amp rating seems a little crazy. But for 5 amps these work.

Sizzled and let the smoke out within 10 seconds. What did i expect with no heat sinks. Those mosfets might deliver the advertised amps for a second under god knows what ideal lab conditions, but normal use will fry them. 3s, 10p, 18650, victron smart charger.

works well, if installed properly

I have not had a chance to test these as I got a deal on a already assembled battery that I used for the intended project. However looking at the BMS board and circuit it is well made and appears to be the same as similar boards with the same features. So there should be no issue with the board itself.I do need to build a pack to replace a bad solar battery in 12V, so as soon as I build it with this BMS board I will update this review if there are any issues I find as always.

I recently ordered these BMS boards for my project and the last items I got have defect.One does not load on higher current and the other board will not detect and stop the battery discharge voltage.I believe those boards have never gone through any inspection at all. This is 50% of the devective boards I received from them!

I wired it to three18650 cells as indicated. It charged them initially, however, after the first charge cycle, the battery management board failed.I expected it to work far beyond a single charge cycle.The cells were new and well matched, so they were not the issue.

Sloppy production led to dangerous overheating.