Battery voltage. If I were to hazard a guess, it looks to be two disposable batteries, almost fully charged, each cell rated at 1.5 volts new. Or rechargeable batteries, each cell at 1.2-1.3 volts full charged, with a degree of measuring accuracy factored in...Thank you, I've been searching for a few months through the manual
if they could of gone with 3 batteries, this would be perfect.
i was told there would be no math...
if the radio uses 3 batteries and they come in 4's...try buying 12.