Hmmm.

I did not jailbreak my phone. I use it for a LOT of sales calls, in one day roughly 5 - 6 hours usage and maybe once in a while 3G is turned on to use the Maps feature to find my way around a new area.

So far, my phone needs a recharge every 2nd day. By the 2nd day, it's hovering about 9% - 11% thereabouts.

I have turned off location service, 3g, emails etc. I only turn them on when required.