Thank you for all the replies, admittedly yes, you can't get any more fancy than what is essentially a {device FOR "OTHER STUFF"} if you're going for the caveman method.
On the other hand it will work 100% of the time, at least 50% of the time if you learn how to heat it properly. Provided ofcourse the math works out.
I have resorted to back-ups in the mean time, especially the usb-passthrough, which made me think again, why not connect a 25000mah powerbank with usb to your passthrough? Would that even be possible?
Absolutely; however, be aware of the power requirements.
For example typical usb power supplies output 1 amp or 2 amp, which works out to effectively 5 to 10 watts.
And if you get a usb car adapter, you can just plug in there.
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