said by 40883644:Yes, I have a 3 amp 15.6v NiMH pack in there I built using 13 matched sub-c cells. I am testing the brown out period now which is looking good since the radio will operate down to 5v.
Your NiMH battery bank will last much longer if you wire it for 6 or 7.5 volt operation. Since the radio actually runs on 3.3 or 5 volts you are wasting more than half of your battery wattage when you exceed 10 volts due to voltage regulation. Those batteries are characteristic for holding nearly full voltage up to the point of exhaustion which is another reason a lower voltage bank will work so well. You can put 4 or 5 in series and then parallel those as needed. Try different combos, one will be best.
