At work (university) we got a 10T after some 10 years of running two 722s since 2005. Then a few years later, got a 10II. No problems at all, we'd use them at least several times a week. We always ran the OEM AC power pack with the 8AA pack as the backup. The 8AA pack is somewhat complicated and I'm surprised it actually didn't break. I'd take out the cells maybe every 4 months to recharge.
If you have power problems and call SD Support, the first thing they ask is to bend the power pack tabs in, where they go into the recorder. If you go through the Hirose, that is not a problem.
I have some photos of my personal 10II with the top off if anyone is interested.