if you use ubuntu in text mode or with fluxbox, the battery status is not shown, so to see how much hour the battery is left you can use command "acpi".
you just type acpi it will show you the information, example:
root@dara-K42JB:/home/dara# acpi
Battery 0: Discharging, 100%, 00:1:34 remaining
-- my battery is fully charged (100%) and and it will last in 1 hour 34 minute later.
acpi has many other other you can type "acpi -h" to find out, you can get the temperature of thermal, etc....
this is the output of acpi -h
root@dara-K42JB:/home/dara# acpi -h
Usage: acpi [OPTION]...
Shows information from the /proc filesystem, such as battery status or
thermal information.
-b, --battery battery information
-B, --without-battery suppress battery information
-a, --ac-adapter ac adapter information
-A, --without-ac-adapter suppress ac-adapter information
-t, --thermal thermal information
-T, --without-thermal suppress thermal information
-c, --cooling cooling information
-C, --without-cooling suppress cooling information
-V, --everything show every device, overrides above options
-s, --show-empty show non-operational devices
-S, --hide-empty hide non-operational devices
-f, --fahrenheit use fahrenheit as the temperature unit
-k, --kelvin use kelvin as the temperature unit
-d, --directory <dir> path to ACPI info (/sys/class resp. /proc/acpi)
-p, --proc use old proc interface instead of new sys interface
-h, --help display this help and exit
-v, --version output version information and exit
By default, acpi displays information on installed system batteries.
Non-operational devices, for example empty battery slots are hidden.
The default unit of temperature is degrees celsius.
Report bugs to Michael Meskes <meskes@debian.org>.
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