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

Very good balancer, low consumption and works perfectly

I really like this active equalizer board. Keeps the cells within 1mv of each other. Using it with a 100 AH battery. This does not have a current limiter or over voltage control as a BMS does, But in my case, works better. All I needed was a balance unit and this one is just what I was looking for.

Been running this same balancer for years now. Have it balancing a 24ah headway cell bank and it’s done a fantastic job of keeping my cells balanced. Would buy again

This balancer/equalizer is doing what factory BMS/software can't. Balancing my three Valence batteries above 14.4V. Cell spread went from 30mV to under 10mV. The only problem is that the connector on my batteries is smaller than on the equalizer, so I had to improvise with some jumpers.

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.

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.

Lasted 24 hours. I hooked this up checked and re-checked the wiring and then plugged it in. Led came on, so I knew it was working. Checked with my current meter and current was flowing thru the un-balanced cells. Checked four hours later and the out of balance cells were slowly coming into balance with the rest. Then, the next day, I came out to check and I could smell some component had burned. I checked the balance board and three components had burned up. Decided this was not a good solution and bought a new BMS (way more money than this) with active balancing that worked much better.

I use these along with a bench power supply to top balance new battery packs and they work much faster than the passive balancing in the typical BMS. The solder jumper (just left of the connector) labeled RUN can be removed and a switch added to manually balance a battery pack, but it would be great if more BMS manufacturers would start including them to run automatically when needed.