1. Charge your Chromebooks so that the battery is at least 80% full.
2. To slow the discharge rate during storage, do not physically remove the battery from the Chromebook for storage. Instead, take the following steps:
a. Connect the device to a charger and turn it on.
b. Hold Refresh Refresh and Power Power at the same time.
c. While holding these keys, remove the power cable from device and then release the keys.
The device should shut down and remain off.
d. Confirm the battery disconnect worked by pressing the power button.
The device should not power on, despite having a battery charge. The Chromebook won’t power on by touching the power button or opening the lid, until you plug the device back to a power source.
This is the ideal way to store devices. It keeps the Chromebook in a stable, powered-off state.
Source:
https://support.google.com/chrome/a/answer/9139543
Get your Chromebooks ready for school
A week before classes resume, get the Chromebooks ready for students.
1. Connect the Chromebooks to a charger and a power source.
This will get them out of the battery disconnect state.
2. Power up your devices.
3. Connect your Chromebooks to Wi-Fi and update them to the latest Chrome OS release.
This can take time, as multiple Chrome OS versions might have been released since the last time the device was updated.