Test your Chromebook Battery

As another school year comes to a close, many schools are packing up their Chromebooks for a 3rd, 4th or even 5th year.  These older Chromebooks are likely (or will soon start) experiencing battery issues.  This is a great time to check their battery health in preparation for next school year.  Here’s how (there’s also a GIF at the bottom of the post):

  1. Close all open tabs.
  2. Open Crosh (Chrome OS Developer Shell) using Ctrl+Alt+T
  3. Type “battery_test 30” and press enter.
  4. The first number that reads out is your battery’s health (from 0-100%).  The higher it is, the better.  As a general rule of thumb, if it’s over 50% on an older Chromebook, you’re in pretty good shape.
  5. After 30 seconds (the number you typed in above) you’ll see how fast your Chromebook is discharging.  You could’ve typed in a smaller number to make it go faster, but the test may not have been as reliable.  If it’s discharging at a rate of more than 0.10% in 30 seconds, you may have issues in the future.

Of course, a weak or rapidly discharging battery is not a big deal if the device can be plugged in throughout the day.  But if you’re in a 1-to-1 school where students carry Chromebooks from class to class, a battery that is under 50% health and discharging faster than 0.10% in 30 seconds won’t make it through the day.

Chromebook Battery Test Animation