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Every time I turn on my computer, I see a message saying something like:

Your battery may be old or broken.

I am already aware that my battery is bad. How do I suppress this message?

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Wow. This is question #1. – John Scott Jul 23 '14 at 23:41
Phew, and I thought the first question wasn't going to be something great, and instead something silly that probably got closed! I am glad to see that the first question ever asked is a decent one! :D – Paranoid Panda Oct 25 '15 at 16:07
up vote 34 down vote accepted

Maybe these instructions will help you to get rid of that message.

Added instructions from the link, Alt+F2, then type in gconf-editor.

Navigate to /apps/gnome-power-manager/notify/low_capacity and untick the value.

Or a single command:

gconftool --set /apps/gnome-power-manager/notify/low_capacity --type boolean false
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This worked for me:

If you have a machine with Windows as a dual-boot option, you can boot to Windows and let the battery recharge here. When the battery has recharged for a while, you can boot to Ubuntu and let it do the rest.

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In Ubuntu mate, gconf editor is not installed by default and installing it will not help.

Instead, you should use dconf editor.
You will need to navigate to /org/mate/power-manager and then untick notify-low-capacity.

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