Created attachment 187107 [details]
Battery status icons. Now with bars. :)

This was suggested to me by a user, who argued that having bars for the battery fill would make it easier to distinguish the charge level being indicated. It makes sense, provided it is practically achievable.

Jon's research into status indicators [1] also points out that this kind of treatment is consistent with other icons, such as volume and signal strength. Discussing moblin's icons, he wrote:

"The use of finite states in the battery levels is nice because it mirrors the states of the volume indicator and since it doesn't imply a continuum."

I've attached an attempt to modify some of the icons. Might be rubbish, but it's grounds for an evaluation at least.

[1] https://live.gnome.org/GnomeShell/Design/Research/StatusIndicators