Released a new version today with some updates.
Download from http://maemo.jeroenwitteman.com/BatteryGraph/ (for now)

I have uploaded it to extras-devel, but I'm not listed as the package maintainer (still pending ) so I cannot promote it to testing.
Anyone knows how to fix that? See http://maemo.org/packages/view/batterygraph/

Changelog 0.2.2-1

• Added option to move forwards/backwards in time by clicking on the right/left side of the graph (clicking in the center will toggle fullscreen)
• Added minimum and maximum value for voltage and current in the graph
• Added database statistics