Could be a bad charger, could be the radio is not designed to be charged while ON. Most radios say in the manual to charge while off. Do the lights on the charger light up when you put the radio on the charger? (If it has lights) If it does have lights and the lights do not come on, it could be the charger contacts, radio contacts, battery contacts, both inside the radio and the battery. Bad wall transformer, transformer plug, broken cord, etc. I use a pencil eraser to clean contacts or rubbing alcohol with a rag. You must clean off the dust if you use the eraser. Post if it does or does not work!
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Could be a bad charger, could be the radio is not designed to be charged while ON. Most radios say in the manual to charge while off. Do the lights on the charger light up when you put the radio on the charger? (If it has lights) If it does have lights and the lights do not come on, it could be the charger contacts, radio contacts, battery contacts, both inside the radio and the battery. Bad wall transformer, transformer plug, broken cord, etc. I use a pencil eraser to clean contacts or rubbing alcohol with a rag. You must clean off the dust if you use the eraser. Post if it does or does not work!