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.