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xp-m battery life

As far as i know...

P3 and P4 M are better at battery life...

XP M's are better than P4's...
 
My guess would be : (best to worse)
P-M > G4 >>> low-voltage XP-m > low voltage P3-m >> XP-m > P3 >> P4-m >> P4
 
Generally, in my experience:

P-M (Centrino) = Celeron-M (Centrino based) >> XP-M (Barton) > P4-M (Northwood) = Celeron M(P4 based) > XP-M (TBredB based) >> P4-D (Northwood) = Celeron-D (P4 based)

where >> denotes a larger difference.

Haven't yet used/seen how an Athlon 64 fits into this, my guess would be a little better than the XP-M.

I personally have a Compaq Presario 2100 with a xp-m 2400+ (barton 1.8GHz) CPU and get about 3-3.5hrs battery life from a 8-cell battery.
 
Oh yeah, another (hardware) thing that influences battery life a lot is the screen size. Could make up to a 10-25% difference.
 
And screen brightness, too. If you crank up the brightness, your battery life could be significantly less as well.
 
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