I have been seeing these batteries on line - K2 Energy LFP batteries, 25.6V, 9.6AH. They seem to be coming out of some sort of medical equipment, like wheelchairs or something. They are going for very cheap - $50-60 online used. That means $250 per kwhr, which is better than anything outside used EV batteries.
So I got two and ran some tests. Charged to 3.65VPC, discharged to 2.5VPC at about C/2. They clocked in at 7.10 and 7.06 AH respectively. So that means they have about 75% capacity left, and are really about $360/kwhr, which is still not that bad. Still much better than new CALB cells.
I'm considering building a 48V bank out of them for range extension of my current EV (a Prius Prime.) $600 for 2kwhr, which would extend my range by about 9 miles.
FYI.
So I got two and ran some tests. Charged to 3.65VPC, discharged to 2.5VPC at about C/2. They clocked in at 7.10 and 7.06 AH respectively. So that means they have about 75% capacity left, and are really about $360/kwhr, which is still not that bad. Still much better than new CALB cells.
I'm considering building a 48V bank out of them for range extension of my current EV (a Prius Prime.) $600 for 2kwhr, which would extend my range by about 9 miles.
FYI.