6S 7S 5.5A Capacitor Active Equalizer Balancer LFP Lifepo4 Lithium Lipo/Titanate LTO Battery Energy Transfer Active Equalization Module Faster Whole Group Balancer

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.

I found this battery balancer very useful and effective. I used it daily for months, but it died due to my error. Please triple-check the battery pack's resistance. I failed to notice a dead battery with high resistance, and the capacitor exploded and melted my silicone mat. The photo shows the melted area on my mat.

This Active Cell Balancer is great! I had a very unbalanced 12 Volt (3 series) Li-Ion battery pack and it gradually brought all 3 cells to the exact same voltage (within a couple miliVolts of each other). What I really like is that it balances the cells regardless of their voltage or state of charge (unlike the passive resistor cell balancers which only work when the cells reach 4.2 Volts). This is my favorite feature since I only charge my cells to 4.0 Volts (approximately 80% state of charge for long term life). I performed a very careful measurement of the quiescent current and it is less than 10 mA (so no problem for my setup to leave it running continuously). A great product!

Balanced a badly unbalanced 7s3p Li-ion battery in just a couple of hours. Much more effective than resistive balancers.

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.

Could not be more mad.. I let this run for about 4 days hooked up to my 20s 72v ebike battery. I have about 4 rows of cells that became pretty out of balance over time. Progress was looking good every few hours I'd check it and voltage was slowly equalizing from the top down. Came out this morning and my garage smelled off.. Checked the board and it was off and not powered anymore though plugged in. Checked the cells top down and it started to looked good 3.7v on the dot, the last two rows however 0 VOLTS!!! My 72v battery was outputting only 56 volts. It completely killed the last two rows.. This tool seems like it has the potential to be awesome - however my was clearly damaged and destroyed my $500 battery. I DO NOT recommend this to anyone.. manually balance each row and take the slow long route unlike me. Genuinely hopes this review helps save someone else's battery 🙏