"... In my daily use, even though I'm not what would be considered a heavy user, I rarely was able to get the battery below about 50% during the day"
That's precisely why I changed to a Nokia E71... 50% for a non heavy user is not really good you know?
There's been reports of heavy data users (constant Push Mail and heavy Web/Media) where the 910 don't even get through 3/4 of the day in a single charge.
The Nokia E71 in the other hand takes me through the weekend with PushMail on all day and moderate web, gps, music, games with no problems.
There's reports of non heavy Nokia E71 users that can go as far as 6 six days on a single charge!
(however the most I've gone is 4 days with push mail turned off and very moderate usage).
But if you don't like another OS other than WinMo and a touchscreen is a must, then stay with this poor performer...
Cheers!
RayanMX