Tested 100%+ Valence U-Charge U1-12RJ LifePo4 Battery 12V 40Ah 512wh

Every battery is fully tested and comes with the printout of the test report which shows the capacity and charge/discharge graph. Every battery tested 100% capacity or higher so these likely never were used and just stored in the hospitals for backup. There is a BMS already built in to each battery.

If you want to series connect them you should charge each module fully then connect in series. You can also parallel them. These are one of the most trusted and best built batteries on the market. They are used in many hospitals. Bolts are also included.

You can series up to 4 to make 48v modules.