Batboard

Have a Pro5150/Ht750. A couple of weeks ago it started acting like the battery was diying. Pull it off the charger and it would be dean an hour later. Changed to a known good battery and now it wont work period. This battery currently will work on other waris radios just fine. Cant get the radio to power on at all. Any suggestions before I go to trying to fix it. The contacts on the battery & radio are clean as well and the battry is fully charged.
Thanks
Craig