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Fix a Chromebook that has a battery that drains fast

We'll rule out brightness, apps, and settings, then isolate the cause—high brightness, background apps, or old battery—or tell you when to call support.

Troubleshooting · Home maintenance
5–15 min
What you'll need
  • Chromebook
Step 1 of 5

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Steps

Goal: Rule out brightness and apps so battery lasts longer.

  • Lower screen brightness.
  • Good: Brightness reduced. Proceed to Lower brightness.
  • Bad: Set brightness to 50–70%.

Lower brightness

Goal: Reduce the largest power drain.

  • Press the brightness-down key. Set to 50–70%. Enable battery saver.
  • Good: Brightness and battery saver on. Proceed to Close apps.
  • Bad: Lower brightness further.

Close apps

Goal: Reduce background power use.

  • Close unused tabs. Exit Android apps. Turn off Bluetooth when not needed.
  • Good: Fewer apps running. Battery should last longer.
  • Bad: Run battery_test in crosh. If health is low, call support.

When to get help

Contact support if:

  • Brightness and apps are optimized.
  • Battery health is low (from battery_test).
  • The battery still drains very fast.

Verification

  • Battery lasts longer with lower brightness and fewer apps.
  • Battery saver is on when unplugged.
  • battery_test shows reasonable health (e.g. over 70%).

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Brightness Lower to 50–70%; enable battery saver.
  2. Apps and radios Close unused tabs; turn off Bluetooth.
  3. Battery health Run battery_test in crosh; check health.
  4. Call support Battery may need replacement.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Chromebook model
  • Battery health from battery_test
  • Steps already tried

Is screen brightness high?

Brightness is a major drain.

Lower to 50–70%. Enable battery saver. High: lower brightness. Low: close tabs and apps.

Yes No

You can change your answer later.

Lower brightness

Press brightness-down. Set to 50–70%. Enable battery saver in Settings > Power.

Done

Are many tabs or apps open?

Close unused tabs. Exit Android apps. Turn off Bluetooth. Check battery_test in crosh for health. If health is low, battery may need replacement.

Yes No

You can change your answer later.

Close tabs and apps

Close browser tabs. Exit Android/Linux apps. Turn off Bluetooth when not needed.

Done

Check battery health

Crosh > battery_test. If health under 70%, battery may be worn. Call support for replacement.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a Chromebook battery drain fast?
High brightness, many tabs or apps, Bluetooth/Wi‑Fi on, or old battery. Lower brightness, close tabs, turn off radios when not needed.
Can I fix fast battery drain myself?
Yes. Lower brightness. Close unused tabs and apps. Turn off Bluetooth. Update Chrome OS. If the battery is old, it may need replacement.
When should I call support for battery drain?
If you have optimized settings and the battery still drains very fast. The battery may be worn and need replacement.

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