DIY Lithium (LiFePO4) Replacement for 6V Lead Acid Battery - YouTube
TalentCell 6V 6Ah LiFePO4 Battery Pack LF060A1, 2000 Cycles Rechargeable Lithium Iron Phosphate Battery with Charger : Amazon.ca: Electronics
NASTIMA 6V 6Ah Rechargeable Lithium Iron Phosphate Battery, 2000+ Cycles LiFePO4 Battery Pack for Emergency Light, Lantern, Kids Ride On Car, Deer Game Feeder : Amazon.ca: Sports & Outdoors
NERMAK 6V 6Ah LiFePO4 Lithium Battery, 2000+ Cycles Rechargeable Lithium Iron Phosphate Battery for Emergency Light, Lantern, Kids Ride On Car, Deer Game Feeder and More with BMS (F1 Terminals) : Amazon.ca:
INVENTO 6V 1000 mAh Polymer Ni-cd Rechargeable 5 AA Cell Battery Pack for Cordless Phone Toy Car DIY Project : Amazon.in: Electronics