ExpertPower 4 Pack 3.2V 304Ah LiFePO4 Lithium Battery Cell | UL2580 A+ Grade 4000-7000 Life Cycles & 10-Year LifeSpan | Deep Cycle Rechargeable & Electric-Vehicle Grade

These have been great so far. It took a while for me to put them in production because I was waiting for a new version of my preferred BMS to reach a stable release status. I charged them individually when received and again before assembling my battery. You can see from the picture they are very well matched.

So far I am happy with the cells. Basic testing put them within 3% of rating and that may be from my testing methods and not the cells. They are not swelled like some I have purchased. They may cost more than others here, but I can see small things that are better than others I have purchased. Things like the covers aren't peeling at the edges, nice polarity indicators, same number of jumpers as cells, cases are not bowed etc. If there is something I would ask to change it would be the aluminum bus bars. Aluminum is about 60% as conductive as copper and these are fairly wide bus bars, but it just feels a little light duty to me. This minor concern did not prevent me from ordering another 16 cells. If I have any issues with these or the next batch that is currently in shipping I will update this.

Came pretty fast. Packaged very well. Everything was there. Would have liked an extra screw just in case, could have used 8 more metal tabs as well. The price is high considering some pre made batteries compare in price. Its way cheaper from china (same cells) but, Amazon makes it easy, covers shipping, has guarantees, and comes in less than a week. Dont get anything like this unless you know what you are doing. I am keeping them on this table for a month or so to see if they cover the panels/usage before permanently installing them.

Great packaging. Clean sparkly and new. Minor bubble defects in individual blue shrink wrap, but i dont consider that anything to complain about. Every single cell metered at 3.29v. I am pleased. Haven't done a capacity test yet, but I dont have a reason to believe they'd lay short.

I purchase 24 cells , They all came in great shape No dings, all tested above there amp hr rating. I put together 3 packs of 8 for 24 volt system, with 3- 200 amp JK BMS's awesome set up. I had 6 Battle Born 100 amp hr. @ $6,000 Had balance problems for 300 amp hrs. Now I have 912+ amp hrs. @ 24 volts for HALF the price. Been working great for 7 month, so we will see in the long run. So far no problem.

Great value.

Fast shipping, packing was just ok could have been more material / padding in the box. Batteries looked new and tested out at 100 to103 amp hours I purchased 4. At this time all is well, no way to know if I will get the life expectancy stated. Would buy again.

These are the worst batteries I have ever bought in my life. This is the only review I have given, and I have NEVER felt so ripped off in my 52 years. Every single one has gone bad when they swell up twice their size. As a master electrician I have installed solar over 14 years now, and never experienced such a poor quality issue like I have with these. Of the 32 I purchased, only six have not blown up. I have ONLY used name brand controllers and BMS and they’ve NEVER been overcharged. DO NOT BUY THESE BATTERIES!!!!! What’s worse they’re too dangerous to keep around and definitely too dangerous to ship back for a refund. Amazon should be ashamed for even letting these be sold.