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.

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.

Would read full voltage (14v) when measured from neg pad on PCB and the battery pack +, but would drop to zero when trigger on Dewalt was pulled. This may not be designed to work with a conventional brushed motor. I thought BMS PCB was defective, ordered a second one, it behaved the same way.

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.

Great!

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.

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I tested this on my bench power supply. Current limit set to 10 mA, then slowly increased the voltage until clamping occurred. 3.58v was the cutoff for each cell "channel." It was surprising that it was exactly the same across each channel. Make sure 3.58v per cell is acceptable for your battery pack. The balancer does a weird pulsing thing. It pulls a small amount of current for a second, then stops and allows the voltage to go open circuit, then repeats. I'm not sure why this happens, or if it's by design, but it's something interesting to note. I did not test the main power disconnect side of the balancer. It appears fairly robust with a number of MOSFETs. The 100 amp rated connections are solder points on the opposite side of the board.

todo bien

故障した製品を購入やはりBMSが故障、その代品に購入問題なく動作しています、充電制御OK（100A）

バッテリー（－）端子をB-に接続し 本器のOut端子とバッテリー１3.23V（＋）との電圧が2.8Vしかでません。 2台購入しましたが。2台とも同じ現象で使えません。100Aと記載されていますが。疑問です。