I wrote a small app to display the remaining battery charge. [user@nokia ~]$ battery-status [Dec 29 22:57] 97.6% There is also a mode for monitoring battery charge over time, switched on with the -d N flag. The command battery-status -d 10 > /media/mmc1/battery.log & logs the battery state to a media card every 10 minutes. This can be useful for rundown tests, i.e. running the monitor from a full charge until the device shuts off. My N810 can run maemo mapper with GPS, WiFi, and Bluetooth on, and the screen off, for nearly 11 hours: [user@nokia ~/apps]$ tail -f /media/mmc1/battery.log ---------------------- [Dec 29 23:02][00:00] 97.6% [Dec 29 23:12][00:10] 96.0% [Dec 29 23:22][00:20] 94.8% [Dec 29 23:32][00:30] 93.2% [Dec 29 23:42][00:40] 91.6% [Dec 29 23:52][00:50] 90.0% .... [Dec 30 08:42][09:40] 7.2% [Dec 30 08:52][09:50] 5.6% [Dec 30 09:02][10:00] 4.0% [Dec 30 09:12][10:10] 2.4% [Dec 30 09:22][10:20] 0.4% [Dec 30 09:32][10:30] 0.0% [Dec 30 09:42][10:40] 0.0% Note: Because battery-status relies on DBus signaling, running it has the unfortunate side effect of activating the battery applet. I will try to find a workaround for this. http://olya.com/maemo/