If you want to get the battery info form command line here is a way of doing that with the help of upower utility:
Simply use:
upower -dor to get info for only a specific device, first get the device list:
$ upower -e /org/freedesktop/UPower/devices/line_power_ADP1 /org/freedesktop/UPower/devices/battery_BAT0
Then get the info for the device:
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0 native-path: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:02/PNP0C09:00/PNP0C0A:00/power_supply/BAT0 vendor: SANYO model: LNV-42T4751 serial: 490 power supply: yes updated: Wed Nov 28 15:16:01 2012 (26 seconds ago) has history: yes has statistics: yes battery present: yes rechargeable: yes state: discharging energy: 35.13 Wh energy-empty: 0 Wh energy-full: 44.89 Wh energy-full-design: 47.52 Wh energy-rate: 14.957 W voltage: 11.667 V time to empty: 2.3 hours percentage: 78.258% capacity: 94.4655% technology: lithium-ion History (charge): 1354112161 78.258 discharging 1354112131 78.570 discharging 1354112101 78.926 discharging History (rate): 1354112161 14.957 discharging 1354112131 17.688 discharging 1354112101 18.782 discharging
