I'm seeing this issue on a macbook 2,1 C2D:
~$ uname -a
Linux AppleCider 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 
x86_64 GNU/Linux

When I remove the power cable the machine suspends as it is convinced
there is no power on the battery (it is fully charged according to the
indicator on the battery itself).

~$ less /proc/acpi/battery/BAT0/info
present:                 yes
design capacity:         0 mWh
last full capacity:      0 mWh
battery technology:      rechargeable
design voltage:          0 mV
design capacity warning: 250 mWh
design capacity low:     100 mWh
cycle count:              0
capacity granularity 1:  10 mWh
capacity granularity 2:  10 mWh
model number:            
serial number:           
battery type:            
OEM info: 

~$ less /proc/acpi/battery/BAT0/state
present:                 yes
capacity state:          ok
charging state:          charging
present rate:            0 mW
remaining capacity:      0 mWh
present voltage:         0 mV

As has been mentioned before, this is an intermittent error and I don't
know how to reproduce it.

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https://bugs.launchpad.net/bugs/215074

Title:
  macbook battery info not readable, appears empty

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