Quote Originally Posted by Ravens_cry View Post
Dynamo's and generators also existed at that time. Batteries are not the only option.
Quite right my good sir.

Quote Originally Posted by Asheram View Post
But would your character have that knowedge? The only think we know about the perk is that it's called "futuristic device" I agree that such a thing could be done, but we don't know how, why or in what manner the character obtained the device and how much he or she knows about it.
Indeed, though knowing the involved voltage is about all you need. IIRC, most phones have a diode to protect against shorts, including picking the wrong polarity. If it came with a charger, you couldn't use the charger, but most of them have the voltage printed right on the label.

I've never played CoC, but I think I'd go with the motorcycle and sidecar.