PowMr Battery Equalizer 48V - Battery Voltage Balancer,for 4×12V or 8×12V or More Battery Bank Extend Battery Life 1 Year and More, Support Gel Flood AGM Lithium Battery HA02 Balancer

Got this on Jan 15 2026. Worked great since then till a few days ago when the system shut down low voltage and the balancer was very hot, but but not enough to burn you. Left it to see if it would bring things back in line but it stayed that way for a couple days. Then I swapped it into an identical 48v system with the same exact model balancer that worked fine and it got hot again right away. Put the original back and it's still cool like always. Sent feedback to vendor to see if they will help.

I have used lithium batteries for about four years on two separate 48v golf carts, one with 4 12v batteries and one with a 48v battery, and over that time I have numerous issues and have had several batteries replaced under warranty. My last problem was the one with the 4 12’s. One or more of the batteries seemed to go down before the others and the cart would stop. When checked all of the batteries proved good. The problem was an erratic discharging which this equalizer handled and the cart has never run better or longer. This a a must product for anyone with a 48v lithium powered golf cart. . Don‘’t think twice about installing it, just do it.

Easy to set up and the wires are clearly marked. After installing, my 12V batteries stay much more balanced. The connectors feel solid and the unit is compact. Works as expected and gives peace of mind for battery health.

Does what it advertises. But if the batteries are pretty far apart it works really hard to balance the batteries. In doing so there is a tremendous amount of heat it creates. I purchased a set of 2 heat spreader that have adhesive to dissipate the heat more efficiently and hopefully vastly increase its life span I recommend any version that looks similar behaves the same way. I would Def buy a heat spreader.

They're easy to use, and they give significantly longer functional lifespan to 48v batteries built out of smaller 12v batteries. On golf cart conversions, these nearly double the range. They encourage even loading of the smaller batteries, and extend their lifespan significantly. They also make it much easier to wake the batteries back up if the BMS disables them due to over-charging; you can use a standard booster box to wake up one 12v battery, and the BMS tries to balance all 4, meaning they all wake up without having to jump each battery separately. They do get a little warm during extended use, but they don't heat up at all when balancing my solar batteries.

So, I had ordered one of these from another seller almost a year ago and it did not work. Thought that these were probably fake or just didn't work very well, or noticeably at all? Well, I never stopped thinking about how badly I wanted my 16(1S2P) golf cart battery array to be balanced because the voltages were all over the place even after a few equalization cycles. So then I saw one of these again and decided to just give it another try. Well... It works amazingly well! I now have 2 hooked up after digging through the guts of the old defective one and repairing it now that I know when they work, they WORK! If you happen to be in close proximity to your battery bank on the other hand, they emit a loud, high pitched "coil whine". Enough to make some people hate them. I for one would much rather my multi-thousand dollar battery bank gets the treatment they deserve for faithfully serving me up my collected solar energy 24/7. Will for sure be getting more of these!

The good: I wired this up to four 12V/200Ah LiFePO4 batteries in series, one of which was noticeably lower in capacity than the rest, and it took about a day to bring them all within 10mV of each other. The so-so: I can't really say that equalizing all the batteries at the top helped much with extending the usable capacity, but it did, at least, stop that low-capacity battery from hitting 17V+ while the other three were still at 13.6V or so. This equalier does - er, did - make a faint high pitched whining sound in operation but I didn't find it to be loud enough to be objectionable; YMMV. The bad: It caught on fire, obviously, but the actual cause is a mystery since the battery was balanced and around 60% SoC. There are two MPPT solar charge controllers set to 56.2V max that can supply up to 30A or so total (only 4 x 225W panels for each of them) and an outboard 54.6V / 15A charger as well, but it wasn't running at the time of failure, so it doesn't seem like it was a case of excessive current. Note that this same equalizer is marketed under various brand names but all look very similar - I wouldn't trust any of them at this point, but if you can't resist the siren song of a cheap price, I strongly recommend splicing a 15A fuse inline with each positive wire.

Overall I give it high marks. Pretty much all 12 volt LFP battery packs have internal cell balancing. However multiple 12 volt LFP batteries in series tend to become misbalanced over time, leading to a reduction in overall string capacity. This equalizer redistributes excess charge from the strongest batteries to weaker ones, eventually resulting in each battery having the same voltage. LFP batteries have a very flat voltage over a large range of charge/discharge. As the batteries near full charge or discharge the voltage change (and voltage differences between batteries) becomes noticeable. The photo shows the various equalizing currents being sourced or drained from each of the 4 LFP batteries using Hall effect current sensors on each of the battery connections during the end of a charging cycle. What I am especially impressed with is unlike the BMS balancers within each of the 12 volt batteries which use resistors to bleed off excess charge as needed, this unit actually transfers charge which does not generate the heat (loss of energy) that would be the result of the higher currents this unit can develop. The only minor drawback is the very small constant current draw this unit consumes. I measured about a 15 degree F increase in temperature on the case. This might equate to about 1-2 watts being consumed continuously regardless of equalization.