Do you live in a 3G/HSDPA area? WM5 did not fully support 3G, so if you're using push-mail or other data services in a 3G area, your radio is using a bit more power than previously.
I actually found a significant improvement in battery life with the official WM6 over the older "leaked" WM6 rom I had been running previously.
If you are in 3G, than you can force it back to GSM to see if that helps. Go into settings/phone and look under the "services" tab for "Band Selection". Change it from Auto to GSM. |