HiXiMi 3.2V 20Ah LiFePO4 Cell Battery Rechargeable 20000mAh Lithium Iron Phosphate, Max.Continuous Discharge 60A, Support Multiple Series or Parallel, Flat Top,for Ebike Battery, Outdoor Applications

Bought 4 packs of these 20AH cells to build a 16s LiFePO4 e-bike battery. All of the batteries came packed well in foam. Each box includes plastic brackets. Those brackets fit together on 4 sides with small tongue & grooves. So you can build any size battery you want. (i.e. I’m building a 2x8 array but I could just as easily made a 4x4 battery.) This is a really nice feature that wasn’t in the listing. But i appreciate that the battery holders are included. All of the cells tested at 3.2VDC +/- 0.005. The cells are new and in good condition. They have no dents, scratches, or previous welds, and all of the lot numbers match up. Each 20AH cell weighs approximately one pound. I will report back once I receive the BMS and am able to fully test the cell capacity. But so far I’m very impressed! [Update] 8 Months in now and these cells are still going strong in my e-bike. They perform to their rated capacity and current with zero issues. I am VERY happy with these cells. [/Update]

Purchased 16 of these 3.2v 20ah LifePo4 (C40) cells to build a 16s (nominal 51.2v) eBike battery. Glad the proper-sized holders were included--one less item to purchase. They were well packaged in 4 boxes of 4 cells each. All measured approx. 3.215v. Didn't top-balance before connecting all the cells in series. Not surprisingly, experienced a 230mv delta (and a cell high voltage disconnect) when we first tried to charge them. Temporarily decreased the charge voltage. The low current passive balancer on the JBD BMS took about 4-5 hours to reduce the delta to 5-10mv. Did a load test. The battery/cells easily produced their rated 20ah (with a .4c/8a load). The cells remained well balanced (<=10mv delta) down to approx. 48.0v. As for the ebike build itself, we arranged them in a 2x8 array and mounted a JBD 50a SP17S005 bluetooth BMS at the small end of the cell pack (this BMS requires programming if used with lifepo4 cells). Encased everything in black shrink-wrap, then cut out panels of black 1/8" HDPE to make an enclosure. Encased it in black shrink-wrap again. Would have loved to use something more substantial to better protect it, but it already measured 14.5 x 6 x 4 and weighed 17.5 lbs. as-is. Too big and heavy to mount anywhere except on a rear luggage rack (cushioned the bottom with 1/4" neoprene). We could have used 56, 5ah 21700 NMC cells (4p14s) and obtained the same 20ah. This battery would have been roughly 30% smaller and 40% less weight. However, the upside to lifepo4 is significantly more cycle life and a more stable chemistry (less risk of thermal runaway).

Awesome batteries. Big heavy and durable. Excellent price also. Hope to see this seller offer more large cells especially ones with thread terminals.

The batteries were very good and packaged well. All batteries tested at 3.21 volts. I bought four sets to build a bank of batteries but ended up going another Direction and are returning 3 sets while keeping one set to build a 12 volt battery for my radio hobby. The batteries are pretty large but it's not a problem they're very very good batteries. I will upload a small video of the battery that I am building with these cells when I am finished. The four cells that I did keep all charged up nicely and tested a little over 20 amp hours.

These things are amazing, way more powerful than I expected I have three packs of four cells each making a 12 cell pack. I'm planning on putting them on my ebike and using them for anything else I need 40 volts and a lot of amps for. I made a little mistake holding the nickel strip to trim the proper length and brushed against an extra cell contact which immediately vaporized the strip in my hand going across two fully charged cells. Initial charging seems to indicate very consistent capacity and very similar initial voltage.

I made a 4-cell pack to power a small trolling motor. With the included brackets assembly was a breeze. I haven't tested the pack on the boat yet, but all cells are changing correctly. Should be a very versatile pack, that should easily jump start a small engine if needed I may even use it to power an inverter. Definitely would buy again.

Impressed with these 20AH cells. Manufactured battery pack w/ 4 cells, working very well. Tested pack at C/4 rate and results show a real 20AH capacity.

These hold lots of power and it takes heavy power to charge them as well. The have a continuos drain of 60 amps. I have 16 of them for my bike, i am wiring them all in series then using a buck converter inline with the bikes current batteries. Btw, these things easily melt a nickle strip in a direct short. I was using magnets to temporarily hold the nickle strips on, and I goofed up removing the magnets and one magnet slipped over to the other battery causing a dead short. It was a nyodium bar magnet, it fried the magnet and broke it in half. That magnet no longer has pulling power. I have experience building a battery pack from 18650, wow what a difference these monster batteries make. I have 16 of them, be carefull about shorting them out, not for the battery but for whatever metal shorted it will get fried and may burn your hand before you figure out why your hand feels hot.