Either use gconf-editor (the nice GUI one) and navigate to /apps/gnome-power-manager/notify/perhaps_recall and set to false or use gconf2...
Code:
gconftool-2 --set --type bool /apps/gnome-power-manager/notify/perhaps_recall false
Long description of this key is:-
Quote:
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If we should show the recalled battery warning for a broken battery. Set this to false only if you know your battery is okay.
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Which sounds like what you are asking for...