Strange, I guess battery performance differs no matter what.
I have a 14 work hour day, IT consultant/systems admin.
I put my phone on the charger at 10pm every night and I have a full charge when I leave in the morning at 7am.
I have at least 12 apps running the the background at all times. These include IM apps (googletalk/WLM/Yahoo! Messenger/BBM), Google Maps, Viigo, Web browser, Gmail, plus I have my wifi activated and which I then connect to my wifi network once I get into office.
I'm on EDGE/3G throughout the day.
I send/receive at least 80 e-mails a day, plus a make/receive at least 15 calls a day and I never have to place my Bold back on the charger until I get back home at 9pm.
I'm down to about 5% by then, but I'm still good.
I'm using .282 now and I had the same great performance with .247.