I am also experiencing battery issues ever since getting the recent update. (In addition to losing the teracube launcher, as mentioned in this topic: https://community.myteracube.com/t/recent-update-brought-back-google-on-home-screen/)
As for the battery issues, ever since the update my battery has also been draining very quickly. In addition, it sometimes won’t charge, even with chargers that have always worked before and continue to work just fine on other devices. I plug it in, and absolutely nothing happens: it doesn’t show that it is plugged in, and the battery level continues to deplete.
I decided to try and “reset” the battery by letting it run all the way to zero and then plugging it in. When I did, then it finally started charging again on the charger that wasn’t working for it before. So maybe letting the battery run out helped the issue somehow? Either way, it seems that the update was responsible for the issue in the first place, because I never had any problems with it until right after the update.