Lithium Master 12V 55Ah Li-ion Battery + Charger is a state of the art rechargeable battery pack made with Lithium Iron Phosphate cells designed for 12V devices. Batteries - Newegg.ca
12V 55Ah LiFePO4 Deep Cycle Battery – Lithium Master
12V 55AH INT Replacement Battery for Wheel Horse Charger 12 Tractor - 2 Pack