I'm pretty sure some of you will be fixed by this upstream commit:

commit b971b43c45bef9251e1d6389716b9fbe107802c7
Author: Leonardo Robol <[email protected]>
Date:   Wed Oct 19 17:13:12 2011 +0100

    Use linear regression to get better predicted battery times
    
    For hardware that has no rate data we use the differences in charge over a 
time
    period to work out the effective rate. Using linear regression this 
estimation
    is much more realistic.
    
    To do this, introduce a simple circular buffer and use an index to calculate
    the rate on each update.
    
    Signed-off-by: Richard Hughes <[email protected]>

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https://bugs.launchpad.net/bugs/120258

Title:
  Laptop Battery Time Remaining Outrageously  Inaccurate

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