I assume you are talking about the USDX radio¡¯s battery. The (tr)uSDX has no internal battery.
A charger came with my USDX. Since it is charging 11 V battery, ?I assume it is feeding 11-12V. I never measured it so it is just a guess. I will test it when I get home (I¡¯m in Seattle now). The plug is smaller than the external 12-13.8V ?ps plug which is a common size.
