These are powerful (5kWh each) lithium ion battery packs that were used in a campervan build prior to upgrading. Used successfully for a couple of years before a cell went bad. Each is mated to to an ANT battery management system, but I can't vouch for the condition of the cells or the BMS. 

* * This is offered to experienced technicians only! Li-Ion batteries can be very dangerous. Please don't experiment with this if you don't have electronics knowledge. Please recycle properly if you decide not to use them.