What is happening when your Android phone’s battery suddenly nosedives in power? A phone that normally lasts all day is dead by noon. Why?
Usually, a process has gone haywire. The solution? Just like a computer. Reboot it. That will kill the power-eating process and restore things. If it keeps happening, go to settings/battery and see what process is using all of the power. You may need to uninstall it, or change its settings.