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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Maybe these instructions will help you to get rid of that message.
Added instructions from the link, Alt+F2, then type in
/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