Beta 4 Over 24 Hours
Beta 4 Zoomed in on a period of use
Stock .435 over 24 Hours
Stock .435 zoomed in on a period of use (not the same day as the first image)
Typical use is just web browsing, not games or videos. It certainly looks a little steeper on the Beta4 graph.
Tomorrow I'll flash to the previous baseband and repeat for beta3 vs. Stock. If anyone knows how to make the pictures smaller I'd be grateful... I know how to do it in HTML but I've never posted anything in PHP before!
26/02/2011 Ok, after much delay I'm now running .49 baseband, flashed using Zhidhu's pre-rooted 2.0.2.A.24 found here. As some in the comments have noted, results seem to vary wildly w.r.t. battery life, which is why I thought I'd run tests on them all using the same handset and the same usage (i.e. mine) which should eliminate most variables.