How to Check Your Chromebook's Battery Health

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Chromebooks have a reputation for being overly simple, but you can find out more about your particular Chrome OS machine if you know where to poke around. For example, did you know that you can check the health of a Chromebook's battery, without any other apps and only a few clicks and commands?

acer-open-new

This trick is super useful for finding out if your Chromebook's battery is in its last days, or if its short battery life is due to you pushing it to the limits. Also, you get to meet the Chrome terminal, the Crosh — an amazing name. There's also some optional algebra involved, if you want to see what the results say about your system's long term life.

1. Hit Ctrl + Alt + t to open the Crosh.

1

2. Type 'battery test' and hit Enter.

How to Check Chromebook Battery Health3. Here's your battery's health, measured in a percentage out of 100 percent.

How to Check Chromebook Battery Health4. If your Chromebook is unplugged, it will run its battery discharge test, which checks how much of your battery drains in 5 minutes.

screenshot 2018 12 21 at 10.32.33 amYou can get a speculative battery life estimate (based on whatever action you're doing on the Chromebook) with that result. For example, I plugged 0.69, the result I got, into the following equation:

((100/0.69)*5)/60=

And got 12.07 hours of battery life. That being said, this test doesn't take actual system use into account.

5. Type 'battery_firmware info" into the Crosh and hit Enter.

How to Check Chromebook Battery Health6. Here you'll see the maximum battery capacity (Design capacity), how of that capacity your battery hit at its last full charge, and how many battery cycles you've gone through.

screenshot 2018 12 21 at 9.35.51 am

So, if my Battery Health is at 96.86 percent, that means I've used 3.14 percent of its total life in those 25 cycles.  Then, (96.86/3.14) = (X/25), where X = the amount of cycles it will take to deplete the rest of the battery's health. A simple bit of division and multiplication gets you the answer of approximately 771 cycles being left in your battery, with a total of 796 charges.

But I wouldn't want to rely on long life from a laptop battery once it reaches 400 or more charges. So, if you're thinking about selling your Chromebook or buying a used one, you'll want to run these tests to see how its battery is holding up. 

Congrats, now you're a lot more informed about your Chromebook's battery life! 

Author Bio
Henry T. Casey
Henry T. Casey,
Henry is a senior writer at Laptop Mag, covering security, Apple and operating systems. Prior to joining Laptop Mag — where he's the self-described Rare Oreo Expert — he reviewed software and hardware for TechRadar Pro, and interviewed artists for Patek Philippe International Magazine. You can find him at your local pro wrestling events, and wondering why Apple decided to ditch its MagSafe power adapters.
Henry T. Casey, on