Feature request from Fedora:

  http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=107811

  When 2 batteries are inserted in a laptop the battery charge monitor applet
  on gnome-panel continues to display only one battery with the mean charge
  of both batteries.

  It would be more logical to display 2 batteries on the panel when the laptop 
  has 2 batteries inserted. Each 'seperate battery display' monitoring only
  the charge of 1 battery.

In most cases, I'm guessing that people are happy enough with an aggregate
display, but in the case where people have (say) three batteries and two battery
slots they need to know when to swap out one battery for the other.