I've got about 20 C720 Chromebooks and a handful stopped charging over the summer. The battery indicator light is orange. The battery meter in the menu gets up to between 1 and 50% depending on the chromebook, then the "h:mm until full" timer gets higher and higher and eventually the text disappears altogether.
On a few, the issue was resolved when I updated Chrome OS.
On the others, I've tried:
- Updating Chrome OS
- Performing a hard reset using the refresh and power buttons
- holding down the Esc-Refresh-Power until the ! screen shows up, then pressing Refresh-Power
- Using known-good Power adapters
- Reseating the battery
- Putting the chromebook in pre-charge mode by unplugging it while holding Refresh-Power
battery_test shows battery health above 90%
These machines are about 20 months old. Does anyone have any ideas?