Originally Posted by
HK 45
There are radios that can be charged on 5v and there are battery packs that can be charged with 5v and then it'll supply you with 12v or more to charge whatever you need. Only reason to want something to charge in 12v would be to use a cheapo 12v battery charging configuration. Keep in mind that the 12v will cost you efficiency in comparison to the 5v, as will charging a battery vs charging your device directly.
This doesn't make any sense. To charge a battery you need higher voltage than what the battery puts out, otherwise no current can flow in to the battery. If you can think of this mechanically - imagine a 1:1 ratio pulley. Hang 120lbs from one side and 50lbs from the other. Which side gets a ride up? You have to give the 50lb side some mechanical advantage to be able to move the 120lb side....Same thing with voltages/currents.