12V 100A 4Series BMS Protection Board with Balancing with Overcharge/Overdischarge/Overcurrent/Short Circuit Protection for LiFePO4 Battery Pack

it works though i have not used the full 100 amp current but they keep working at at least 40 amp. The bms actually is still usable while charging as well.I have bought 2 of these and only one failed at the charging port side for some odd reason it would not charge anymore got it exchanged and everything has been fine sense and its been well over 30 days of charge cycles with my solar set up.Now that some one is getting a bit greedy with the price ill have to look for another seller that is cheaper with the same product.

Bought this BMS because ebikeschool from YouTube recommended it. I tested on a 12 V. Trolling battery. But it did not put out 12 V only getting 11.8i bought a second B. M. S to double check voltage. And got the same thing. 11.8. Don't know why they are selling this as 12 V. When you do not output to a Volt, very disappointed in wasting my money. Might be something I don't understand.....

I had good success using this small BMS. I just stuck to a 13.5ah battery pack comprised of 32700 cells, with 12.8 nominal voltage. I used a heat sink. I have ran a 18 watt shop light for 8 hours before the BMS shut off the pack. Worked as I would hope. Turned around and charged the pack with a Lithium Iron Phosphate charger, the charger is one rated for 40 Amps. An intelligent charger, applying what is needed and shutting off when fully charged. I use it weekly. I have two of these BMS and recommend them for light load application. You can run a LCD 30 inch TV with a small inverter, I ran a PS2 on it, lights.This is not meant for running electric heaters. Like household 30 Amp heaters.I use it for operating 12 volt heated jackets and gloves though.I recommend this product.

It keeps my 170 amp battery verry well balance no complaints with this product is worth every penny of it better than dally bms

Do not buy!!!!EDIT: Was sent another one, scratches were worse then the first one.. Just like the first one, same wiring color, same web link, same everything??Did not get the red and black wire harness? The aluminum heat sink. Where the screws are. Looks like it was taken apart, deep scratches.. This looks used, not happy...

Tested this BMS with the battery pack that I built. Tested discharge at 65A-70A, continuous at 20A, and charging at 10 A. Could not detect any heating of the BMS.Works great, this BMS doesn't need a charger, just give it 14.4 volts to the battery and BMS will break connection when the pack is charged and balanced. I didn't test overdischarge and short protections yet.

I used this to charge my 4s10p LiFePO4 battery pack using a CC/CV power supply at 15v as recommended. When it stopped, the cells were not close to being balanced. The specs actually indicate why this might be the case. The overcharge release is 3.65+-0.1v, which means it could be as low as 3.55v, whereas the detect and release voltages are both 3.60+-0.05v, which means it could be as high as 3.65v. Assuming the balancing occurs only at this detect voltage, the charging for a cell could stop (at 3.55v) before any balancing occurs.

This is what you need if your building your own lifepo4 packs. It works flawlessly. I bought two of them(one for each pack). They are protecting my new 4s20p packs and the balancing function is great. Will buy these again in the near future to build four more packs like this.