Well, the upgrade would certainly be a good one: the K-50 delivers better image quality, faster performance, and offers live view and video.
As for the battery issue, this thread may be of help:
https://www.pentaxforums.com/forums/6-pentax-dslr-discussion/125754-battery-d...ra-repair.html
I would double-check the settings. If that's a dead end, then there's probably a hardware issue.
Adam
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