The battry life is almost a deadend discussion since the moment you (as the designer) get 8 hours of battery use, the marketing removes a battery cell or slips in less amp-hours. You'll have to look to reviews to which complete unit has more hours.
As to speed, AMD's 2000+ is about 2.0GHz P4 speed. To compare (non-HT) P4 to Centrino, a rough 2X factor is given to the Centrino's clock speed. This would put the Centrino 1.5 GHz in about the 3.0 GHz Non-HT P4 speed, so it will likely win any CPU benchmark against the 2000+ AMD.
How does an Mobile AMD Athlon? XP-M 2000+ processor w/ QuantiSpeed? Architecture with PowerNow compare to a Centrino 1.5? The power now clains to increae battery life, performance and decrease heat ect. Just as the Centrino. But can it really compare? And how fast in ghz is a athlon 2000+? Please reply to which is more superior as far as speed and battery life.