Well first off you must see if the batteries are in fact good. Once that is confirmed and all connections to and from the batteries and charger and radio are good then the only thing I can think of that would cause this is the charge jack on the radio that is also a switch when you plug in the charger to switch one source on or off depending how its configured. It might be possible that your system disconnects the batteries when yu plug in the charger and for some reason it is not switching back when u unplug the charger.
Look at the jack and see if it is damaged.
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