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Here in the states, I am used to seeing plug in heaters that plug into grid power. This would have the advantage of less added weight as you don’t need a battery, with the disadvantage of only being able to plug in when you have a plug.
One thing about using high end batteries like that is that you would probably need to use a DC-DC charge controller on them to ensure you didn’t shorten their lifespan. Many newer battery technologies are very sensitive to charging power quality. My suggestion if you wanted to use batteries would be to repurpose a battery from something else with similar power requirements an established charging setup, like an old laptop, cordless drill, RC Plane, etcetera.
Supercapacitors would be an option, but might not be practical.
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