Originally Posted by RJKIRK
Does any component in this radio require more than 5 volts? If not, then why the 12 volt battery?
The JR module "standard" is based around 12V. Many newer ones work with less, but as usual if you make a radio with a JR module slot and want to be able to use any existing JR module in it you need to adhere to the standard. HK do sell modules that require 12V by the way.