Lifepo4 U1-50 Lifepo4 12.8v 52.32 669.696 - Needs BMS

These batteries just needs a BMS. The balance lead wires are easily accessible and adding a BMS would be very simple. Also you could series these batteries then add an overall BMS.

Every battery is fully balanced.

Dimensions are 8" Wide x 5.25" Deep x 7.25" Tall

Weight 13 lbs.

Charge and discharge at 20a continuous.

Specs are in the 3rd photo. This is the higher capacity version of their product line.