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:
or 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
