Mostly works well, but... Mostly works well and I love something better than just "since last charge" in the native settings. It has two problems. 1. If it stops tracking, when it starts again the graphs are butted against each other instead of showing where there's missing data. This can lead to the impression that the battery is discharging faster than reality. It really needs to show gaps in collection explicitly. (also noted by Nathan!) 2. This morning when I checked the settings applet, it showed 22% used by Battery Graph!