Ridiculously accurate battery information, so you can actually see exactly how fast the battery is (dis)charging and exactly how many micro Ampere hours it has left. Also contains a simple CPU usage monitor (including info on power-saving C-states), and a simple SD card free space pie graph display. The information is extracted from /proc and /sys and from the output of "df". No root privileges required. The battery meter does a small amount of interpolation between two updates of the charge/energy gauge, which is only updated every few seconds (while the meter updates every half second). You can also check your battery health.