You could add a debug command script, that parses gasgauge and outputs relevant info via eips. Not at home right now, so I don't have the exact path on hand, but it's somewhere in the pillow search bar stuff in /opt
EDIT: Or not, it's actually in /usr/share/webkit-1.0/pillow/debug_cmds.json

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If no one has a little gasgauge-info parser on hand (or a proper thing based on procfs, if the info is there, which it probably is), it shouldn't be too hard to implement, I might even take a look at it myself, I'm not a big fan of the 'hey, let's guess how much charge you really have left from this tiny 2x3px icon' ^^.
EDITē: Or, easier, plug something into the GUI Launcher?