If you pull of the back cover you will find two small fuses near power supply, one of these allows power from battery pack, check with voltmeter for open circuit, I take it that it is not just one battery it does this with.
I was electrician on construction site and we had same issue twice, the fuse blew twice once when we inserted a battery that a backhoe had reshaped and the other time was caused by chargeing packs on gen set that ran out of fuel.
If you only have one battery it will be that battery is stuffed, if on the other hand it does it with at least two known working battery and you are sure it is not one of the two 2AG fuses then, check battery contacts on radio, if it aint that then it will be the only board in it has a problem(or lead to it), if you know how to use a multi meter then check from where the battery connects, after contacts, to board, threw components ie trace it to where the power stops and there is your problem "where it stops". without plug into mains, but with battery in, wont kill you, is only 13.6v i think.
Battery, fuse, connector terminals, cable. board, are your possibilitys in order of likelyness.
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tried fuses its not them thanks
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