Mini Space Heater PTC BATTERY RECHARGABLE

Looking to manufacture a small electric PTC preferably less than 200 Watts. I would also like it to be battery rechargable instead of a plug in. Attached is ideally what im looking for but instead of the plug in, I would like it to be rechargable. Would like it to have the same specs and size of this heater only simply would need it to be battery rechargable instead of power plug in only. [login to view URL]