If you are using it in the truck a better plan is to have a USB charger in your truck and use that to recharge the 18650's via the Nitecore F1.
This is a good powerbank, it's lithium battery so lighter than ones based on 18650s. It was $44 in the sale over the weekend.
https://www.pbtech.co.nz/product/BAP...258mm-thinUp-t
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