A lithium jump starter back is basically a big battery pack to charge your tablet and phones, but then with high amp output on 12v to help start bikes and cars.
Just buy the smallest one you can find. When you come with a big diesel car it won't do, but that is not important for you. More amps is better though, because in the cold you get less amps.
I once met a Belgian couple, and they had the bottom of one pannier cooled for the insulin one of them needed. Only cooled while driving, but had some isolation.
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2011 Overland from Amsterdam to Nepal and back
2018 Overland from Amsterdam to Tokyo via Central Asia and Mongolia
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