Backcountry phone charger

I have two anker products a 21,000 and a 6700. Both work great the larger one is pretty heavy but I think the 6700 is just over 3oz. It will charge my iphone to 100% from 20% twice. Not really sure how much more it would charge as I have done no further testing. If I buy another it will be a 10k.
 
RavPower user here. I have both the 10,000 MaH and the 26,800 MaH models. Use the 10,000 model all the time and works great for me
 
Does the Anker (or any of the others) also work for jump starting a vehicle? I'm looking for the same sort of thing as the OP but for truck camping.
 
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