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[–]Optimus85 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

I've just been using my macbook and my kindle usb cable 😅.

That works too and it's perfectly safe to do so. The advantage of having a charger and extra batteries is you can swap your depleted battery with a fully charged one so you don't have to vape with a USB cable in the way. I've seen similar warnings on batteries too. Just a disclaimer by the company. ¯_(ツ)_/¯