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it is possible that if you changed the battery you forfot to move the slide button next to the battery to the correct position. It often happens to me :-) Please check it, its on the right top corner of the battery, you should not see the red marking, if there is the correct position.
Given that the MC50 has long been EOL, my suggestion would be to scrap your unit and replace it with a Janam XM66 - closest thing in terms of size/weight but faster performance, more rugged, better scanning. In the end, you'll spend less money. Good luck!
You have to first charge the backup battery, for charging insert a fully charged main battery into the MC906x. Then the backup battery will starts charging leave it there for one day. if that message is still coming then the problem is with the backup battery and u have to replce it