looks like a faulty battery… phew... got a replacement battery from ifixit and installed with no issues... booted up and ran fine with a normal drain during use before calibrating.
great, easy to follow directions... which i followed 3 times... d’oh! after the initial replacement, wondered why the picture was slightly out of focus... and it dawned on me there might be a protective film on the camera lens… BINGO. that problem solved… until i had NO picture after the second try. turns out i didn’t have the camera connector seated securely. third time was the charm.
