How to see how full my battery is?

[kazaam]

On Wed, 06 Aug 2008 11:10:22 -0400
Joe DiTommasso <wyznewski at gmail.com> wrote:

> 'cat /proc/apm' in the terminal will show you the current charge level, 
> as well as the time to full charge or full discharge, depending on 
> whether the device is plugged in or not.

This shows me:

# cat /proc/apm
1.13 1.2 0x02 0x01 0x03 0x08 -1% -1 ?

-1 % == battery_percentage
-1 == battery_time

is at least the description from here: http://wiki.openmoko.org/images/3/37/Om-daemons.pdf


But what shall those negative values mean??