Amazon.com: 12V to 5V 3A Step-Down Waterproof Miniature DC-DC Converter Power Supply Module : Electronics
Amazon.com: DC HOUSE 12V 8Ah Rechargeable LiFePO4 Lithium Iron Phosphate Battery with 3000+ Times Deep Cycles and BMS Protection for Fish Finder, Power Wheels, Scooter, Light, Kids Car,UPS : Automotive