12.8V 40AH 512WH LIFEPO4 MODULE WITH BMS
Here are 12.8v 40ah batteries that came out of cable boxes as backup units. We tested a few and they were above 80% capacity. The voltage has been checked to ensure the cells are at nominal voltage.
The BMS appears to be a 30a BMS but the wire diameter used can handle 20a. I would limit the discharge to 20a and limit charge to 15a. There is an inch or 2 of wire leads coming out so you have enough to work with to add your own connector.
You can parallel as many together as you want. Just make sure the batteries are within 0.2v of each other before connecting them in parallel.
The battery weight is 9.75 lbs.
8" x 3.5" x 6"
The vinyl/plastic enclosure may have some imperfections but the battery functions perfectly. Its basically plastic square sheets and vinyl shrink wrap as the enclosure.