3S 4S 12V 5A Battery Active Equalizer Lipo Li-ion LFP LiFePO4 BMS Balancer | Energy Transfer Board, Faster Whole Group Capacitor Balancer PCB, Equalization Module, With Cable

I'm sold. These little guys just work. Latest build is a 4S2P 12v LIFEPO4 and the cells have been as much as .20 out of balance while charging. Within a couple hours they are exactly the same. I've read some horror stories with these and the main thing to.prevent problems is to install these before the battery pack is a mess of mismatched voltages.

worked great to balance my 200AH RV batteries. Cells where ranging from 3.6 to 3.2 a few hours after installing this they where all the same.

These things are amazing. They do a better (more accurate, and faster) job of balancing than my balancing chargers, and can be used for pre-charge, during charge and post charge balancing. I never liked using BMSes on my battery packs, preferring just to monitor conditions closely to get away with using simpler systems, fewer components to break down and the ability to over-power for short periods. I sure wish these had been available 20 years ago when I was actively building a lot of E-bikes and other battery operated systems. They would have made life much easier. Now, if the company would make similar modules that would balance 6 Volt Lead Acid battery arrays, I could vastly improve my solar power system for a reasonable cost. :-)

I’ve been having trouble keeping a custom 140Ah 4S LiFePO4 battery properly balanced. I decided to give this a try and am SO glad I did. Of all the solutions I’ve tried, this one has finally achieved a perfect top balance with all cells at 3.6500 +/- 0.005. It balances at a higher current than most others I’ve used, so is particularly well suited for larger sized setups. It didn’t get hot while working, not even warm to the touch, which is another huge plus since it’s in a closed space in a warm environment. It was running at several amps for an entire day in 90F environment and wasn’t even slightly warm. As an added bonus, it has pads where you can solder on a switch to remotely turn balancing on/off. I use this to disable balancing when battery is not in use, but can flip it on when charging. If you wanted to get fancy, you could even hook up a simple relay to automatically have it turn on with charging and off at rest. At rest, background current draw seems minimal, but I wouldn’t leave it hooked up if storing a pack for several weeks. All around, a FANTASTIC device.

Bought four, cheap, 200AH LiFePO4 cells and a Daly 200A Smart BMS from aliexpress. Had one cell that would hit High Volt Disconnect (HVD) (w/BMS set @3.65V/cell) while the others would only average <3.250-3.300. I cleaned, sanded, swabbed, terminals and switched cells around to no avail. The best I could achieve on differential voltages were always >0.150, oftentimes >0.250 when charging at 30-40 amps. A capacity test yielded about 135AH +/-. After installing this active equalizer the cell differential voltages are always <0.010 and are more often than not <0.003. I now have my BMS set at a HVD of 3.60V and easily achieved 175AH (after charging @ 25 to 30 amps) when I quit the test early. I paid almost as much for the BMS as I did for the cells (the cells were actually that cheap). My thinking was that I would upgrade the cells in the near future for my camp trailer. However, the cells arrived well after I sold the trailer. I bought a smaller (energy wise) truck camper and now have no reason to upgrade. I now plan my energy for 175AH and am quite happy with my cheap battery.

Overall seems pretty solid. Mosfets are G045N03. Driver chips are unmarked. I suspect without looking into it too much (lazy) probably just some type simple square wave generator. Maybe an op-amp oscillator. This device isn't "smart" it just continuously shuffles the capacitors. That's not a bad thing however. It just works. Initial checks on a small battery pack during chargeing seems great... within the quoted 5mV. but then again they are new batteries and may be simply well matched. Big drawback is the noise. I ended up swapping capacitors out for different ones for unrelated personal reasons, but if I recall, the original switching frequency was about 6.3kHz which was audible. After the capacitor swap it was 5.2kHz (Scope screenshot). If this is inside or a shed or something, it wont be a problem, but you would not want this where you occupy your time. Original capacitors are unbranded. I wouldn't personally run this thing at the quoted 5A balancing load. That's quite a bit of ripple current.

Thank you!

I read through the reviews. Some people were having trouble with this equalizer, most reported it to work very well. I'm in that camp. After connecting it up to a 4S2P Lipo that showed one of the packs in the battery was out of balance with the other packs by a fairly good margin. I connected up the equalizer and left it on for two days through mild charging and discharging from my solar panels. The cell packs all came up to with in .01 volt. I powered up some items to draw the batteries down and then recharge them. The cells on the battery that had the balance issue stayed within .03 volt of each other, and once recharged returned to .01 volt difference. Works like a champ.

Never got to use it. Maybe it is meant for an experienced user, Other than wiring order, has no information. Does it need to be used with a charger, Does the BMS have to be disconnected ? Do the batteries have to be fully charged ? When should it be used ? It is a new type of balancer (Capacitive) I don't have time to spend looking all over the internet only to see people arguing pros and Cons. I am using Daly Smart BMS, but it has a different plug for the balancer. It would be a good idea to use a standard plug, so you could just unplug the wires from the BMS, and Plug them into this device.