I have been using Ubuntu 11.04 on DELL Inspiron 14R (N5010) laptop for last three months. Before I switch to ubuntu my laptop battery used to give 2.5 hrs to 3 hrs back-up. But since I have been using ubuntu, it has been reduced to 1hr to 1.5 hrs at max. I tried following commands: $ cat /proc/acpi/battery/BAT0/state which gave result as present: yes capacity state: ok charging state: charged present rate: 1 mA remaining capacity: 4400 mAh present voltage: 12407 mV then I tried $ acpi -b the result was.. Battery 0: Unknown, 100% when I gave command as $ upower -i /org/freedesktop/UPower/devices/battery_BAT0 the result was.. native-path: /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 model: DELL W7H3N08 serial: 7114 power supply: yes updated: Sat Nov 24 11:25:34 2012 (21 seconds ago) has history: yes has statistics: yes battery present: yes rechargeable: yes state: fully-charged energy: 48.4748 Wh energy-empty: 0 Wh energy-full: 48.4748 Wh energy-full-design: 48.9595 Wh energy-rate: 0.011017 W voltage: 12.408 V percentage: 100% **capacity: 52.9253%** technology: lithium-ion Someone please let me know, what is going wrong with my laptop? How can I get charging with full capacity?