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Amazon has Coleman OneSource Rechargeable Heated Seat for $ 49.15. Shipping is free.

COLEMAN ONESOURCE: Power your outdoor gear and devices with one interchangeable rechargeable battery system
HEATED SEAT CUSHION: 4 adjustable heat settings; one fully charged 4800 mAh lithium-ion battery keeps the heat going for 1.5 hours on high (133°F), 2 hours on medium (123°F), 3 hours on low (113°F), or 2.5 hours on pulse setting (low to high)
DUAL PORT DOCK & DEVICE CHARGING: Battery dock on the side holds up to 2 rechargeable lithium-ion batteries (2nd battery sold separately), doubling the runtime; also charges your phone or other devices