I had battery widget reborn installed https://forums.androidcentral.com/e...et.hubalek.android.reborn.beta&token=LKiBGN_N to make WiFi sleep and save battery, that's why there are gaps in Wi-Fi. I thought that might have caused my erratic battery reporting but uninstalling didn't do anything. At some point it just goes flat and won't report anymore, I have to reboot.
Of course it continues to shut down when I plug it into power. :-\
Of course it continues to shut down when I plug it into power. :-\