🔋 HiLetgo 14.8V 4S 30A 18650 Li-ion Lithium Battery BMS PCB Protection Board with Cell Balance – Integrated Circuits Review

Nothing to report - everything works as expected. Just a general note: the balance leads should be disconnected from the board during the wiring process and reconnected after all the leads are connected to the battery.

All I got was the circuit board and wire connectors. There is no documentation at all. :(I need to find documentation somewhere on the internet. Until I do that, I don't know if the board will work as advertised.

I was a little hesitant just looking at the negative reviews and worried that my project would fail. However, since all these things are common, they look real and are inexpensive. I tried. Here as in the pictures. It works great and charges evenly - yes I checked every cell after a full charge! Don't fall for negative reviews.

Using this board to charge the battery I used 18650 3000mA batteries, 6 parallel batteries, 4 times, this board did not charge four 6 parallel batteries in the same way. I used an 18V DC power supply. The final voltage across each of the four arrays of 6 batteries was different, typically in the 3.9 to 4.2 VDC range. The charger I built for the same batteries charged all four rows of 6 batteries to 4.20. These cards work well if you don't care about the maximum charge of all batteries.

As others have said, this BMS is very lacking in documentation. I finally found schematics on other sites and hooked them up correctly. Attached to this review is a schematic from the same BMS listed elsewhere. Hope this helps someone. On the plus side, it didn't light up when I plugged it in the wrong way. Large pads for soldering B+/- P+/- and balance wires are very good. Don't be stupid like me and try to cut off the balance cable plug when the device is on. I unleashed magic smoke and now…

Rating after further testing. 2.5V low voltage cutoff tested. I wish it was higher or adjustable. The trim works, but only above 4.20V. I noticed that it turns off when I touch parts of the board, so this may have something to do with my first results as the board was in contact with the cloth tape. Also, I realized I have a bad cell that will quickly discharge and recover to show a higher voltage. Original Review: It's very frustrating to spend a lot of time soldering everything and realizing…