If you own a Chromebook or any other ChromeOS device, here is a useful trick to check battery health and performance. In order to check your battery’s health, launch the Chrome OS developer shell by pressing CTRL + ALT + T keys, and execute the command
battery_test 0. As shown in the following screenshot, this would result the battery health and current discharging rate.
Hence, you can have an idea about your battery’s health. Chromebooks generally have longer battery backup, may be because of the light-weight ChromeOS operating system.
And, if you are just surprising about the Chrome OS developer shell, it is the command line interface available on the Chrome OS devices similar to other platforms like Windows and Linux, but does not offer much features and functionalities.