Check the battery with a multimeter to be sure it's good. There are internal electronics inside the battery.
There is an internal fuse, F901, but it's pretty small. Replacement, if that is the issue, isn't easy and not something you'd want to tackle unless you had the soldering skills necessary to work on the SMT components inside these radios.
If the battery checks out and you determine it is the radio, you could send it off for repair, but I suspect you could pick up a used radio easier and cheaper than trying to get this one fixed.