Not that you're asking this, but I just switched to the G2 from iPhone 4. It's taking me some time to get used to the new OS, but the display, pictures, speed, etc are awesome. I've been having some disappointment in the battery though in the first few days. I've followed some tips found on here and they seemed to have improved it more to what I was expecting. If I can get the battery life promised, I will have 0 regrets in switching to the G2.
It's pretty normal to experience battery drain for the first few days or maybe the first week since its a brand new battery. It takes a bit of time for it to settle so don't worry as I'm sure it'll get better as you keep using it. It's like this with any now battery so don't worry too much about it. You should have better battery life by the second week. Hope this helps.
Where did you get this info from?
This battery requires NO break-in period, nor do any new Android phones require battery break-in periods!