Originally Posted by Glennzo
Look in System > Preferences > System > Power Management. There are several settings there related to battery power but the list is not very comprehensive in my opinion. Just for the record, last night my Toshiba laptop warned me that there were 4 minutes left before the system would shut down.
that's where I've looked at, but there is nothing about warning's message. there are only options about hibernate, shut down.... but nothing about warning.