BMS Board LiFePO4 4S 12V 120A Smart PCB Battery Management System with Balance Leads Wires and Wireless Module for Lithium Iron Phosphate

Old BMS board stopped working, easy to replace with this one. Works perfect

Does very well balancing cells. Not sure about charge limiting or discharge limiting, but I purchased this to balance my Li-Fe P04 cells and it keeps them within 0.1 volts. Built very rugged and seems of good quality.

Like the fact it worked,wiring instructions and app could be better!will update review in a few months seeing that it's only been operating for 6-8 hrs.

Update February 5, 2022:Removed all stars. The cell balance doesn't work. Connected to perfectly balanced cells, charged with it to 14.2V (4S). Cells lost balance completely, so turned off the charger and let it rest for 24 hours, the unbalanced cells voltage did not change even with a single mV after 24 hours at rest. Meaning there is no cell balancing. A BMS without cell sensing or balancing is worthless - even worse - will destroy batteries that worth 10 times more than the BMS. Returning to the seller.Original review before further testing:It is actually a Daly BMS at a better price and faster delivery. The low temp sensor cutoff doesn’t work… not unusual with Daly as well. The packaging is as good as Daly - very solid sealed heavy aluminium housing. As with Daly, the heavy cables are great, but too short. It would have been better to have it with solid large terminals as at any case you need to create your own cables in order to build a reasonable battery.As with Daly, the cell balancing is passive and limited. I would recommend using a 5A active balancer - can be found at Amazon as well.Will update after checking the charge/discharge cutoff at high/low voltage - this is the most critical feature for any BMS.

I bought 2 12 Volt 100 AH Lifepo4 Batteries at a Great price after about 2 months 1 quit working after contacting the company they sent me a new Battery I was told to do whatever I wanted with the other battery I cut the case open and tested everything ordered this BMS changed it out and the Battery started working immediately I was able to use the Balance lead wiring just plugged it in and replaced the main power leads working Great. Heavy made and easy to use it's a quality BMS

3 months and still keeping batteries balanced sense wires are very very thin concerns me

I needed 4 for this project , had to go to 3 different suppliers for all four. well built , put 40 amps through this bms and did what it was suppose to do .

They shipped me a defective BMS and then refused to offer me a reasonable resolution. The entire interaction was clunky; they sent me a file that wouldn't open, and they wanted me to use tools most people don't have to check the electrical specifications of the BMS, in order to prove if it was defective in a certain way that didn't have anything to do with my problem.I was using the BMS for a relatively time-sensitive project and needed a working product to be able to deliver to my customer. Their ultimate solution was to ship a new Bluetooth module from China, with an estimated 12 day shipping time, despite the fact that the BMS itself had reached me in 2 days. I had conducted my own research and concluded there was a good chance the Bluetooth module wasn't even the problem. Apparently this is a common problem with the Daly-type BMS products. One of the pin-outs on the JST plug intended to power the BMS is commonly dead on arrival, causing very glitchy operation while the module is plugged in, and obviously zero Bluetooth connectivity.TL;DR - the product exists, and if all is well, it's half-decent. If it's not, good luck. Customer support exists, and if all is well, it... well, it exists. But don't even bother.