Cywhrvzsf 3S 4S 5A Active Equalizer Whole Group Balancer Lifepo4 Lipo Lto Lithium Active Battery Energy Transfer Equalization Capacitor

This balances a 12v 420 Ah LiFePO4 pack in an hour. It allows me to top and bottom balance by waiting an hour after an initial charge, and then topping off battery. It allows me to charge from 13.7v (which is the previous max with BMS cutoff and bottom balanced cells) up to 14.2 v (now just self imposed voltage cutoff, could go higher).I have a 4S (4x105 Ah) battery, with a good BMS. The cells are used and not matched well. With a BMS and a Tenergy '5 in 1 Cell balancer' or 'RC Cell Meter 8', it takes about 10-12 hours to balance. This is a great product if your battery uses old or mismatched cells.The biggest downside is no instructions for what LED lights mean. I only ever see the 'run' light on. The others I haven't seen turn on yet.

Purchased for 7s Lifepo4 custom pack (was going to be 8s until I literally made one of the batteries explode by accident (not with the balancer, i just drilled too far) then replaced it with one that did not play well with the original 7 and also exploded....again I did not have the balancer attached and it might have saved me there) but anyway, after $500 in burned/exploded batteries I bought a balancer, this balancer works ok if you have a few days to let it sit then it will bring all the cells to within 0.0 at best. This of course being a gigantic waste of energy storage if one cell is at 3.011 and others at 3.099. So instead of purchasing a 200 or 500 dollar unit (that might not be any better anyway) I've installed the cells to a rolling rack and I keep a multimeter nearby. Once every couple weeks I will wheel out the battery cells and adjust all 7 manually so if one is low I will use a charger to bring it up to the others, if one is higher than the others I will clamp on a 12v RV ceiling light, that was just sitting leftover after I replaced all of them, to slowly drop some energy until all 7 cells read 3.700v. Also I may have OCD, lol. This balancer will keep you in the safe zone so you can set it and forget it for most uses. If you want the ultimate balance, nothing beats a multimeter, a light bulb, and about 24 hours of free time, lol. I'm also glad it will work with 6 to 8 cells, since 1 of mine blew up for unrelated reasons. Also, mount your custom batteries where you can glance at all of them very easily. They puff up before they cause a large explosion and a ton of fire. Standard ABC extinguishers will put it out (ask me how I know) but the fumes probably gave me cancer...

Was very simple to install. Used for a 96ah headway Lithium bank. Installed about 4months ago. Had to take my bank apart to reconfigure using new bus bars & out of 48 cells every single one of them was resting at 3.33volts. I'd say the balancer works perfect.

I bought some low priced 100ah lifepo4 batteries that the manufacturer bottom balanced. I attempted a top balance on them but after two days of messing around and waiting it still wasn't good enough to charge the packs above 14 volts without the bms cutting off due to runner cells.I installed these and then let them do their thing while charging the packs gently (1.5 amps then constant voltage) to 13.65v in parallel. The next morning all cells were equal and the current had dropped to under 100ma so I set my charger to 14.6v at 2 amps and both packs hit 14.6v before cutting off at nearly the same time.I've left the leads connected and will periodically connect them while charging from solar to maintain top balance. I don't want these balancing at lower states of charge because that will undo the balancing it did at the top end.One other thing I think is important to note is that the voltage of the cell (especially with lifepo4) is a terrible indicator of the state of charge. This board balances voltages only so adding a little charge current while they work allows the cells to slowly fill and have their voltages balanced by taking energy from the runner cells and giving it to the lower cells until they catch up.

It made a very noticable difference in my 10kWh battery. Well worth the $24 I spent on it.