I just got my TP2 battery on Saturday and charged it up. I'm starting to think I have a defective stock battery because I am getting MUCH better battery life with the TP2. I work in several buildings and one has no service (gov't facility that blocks signal). I spend a good part of the day there and keep my phone in Airplane mode while there. With the stock battery, I would see some drain there throughout the whole day. With the TP2, it was still showing full when I left. Did some texting, checking mail and web for about an hour or so and was still 85%. This is just with one charge, so haven't even cycled through a few charges. But already it kills the stock battery.
Fit is tight and I have an ever-so-slight gap. Only able to see it if you are looking for it. I have the silicone case so it makes no difference at all to me. The performance difference is amazing. But like I said, I'm starting to think I have a defective stock battery. Going to go over to VZ and see if I can swap it, but am in no rush. May have to order another TP2. For the price, it can't be beat.
What is your usage pattern like?
I talk maybe 30-60 minutes a day, use 20-30 minutes of internet, keep the 3G off and wifi on whenever possible, and otherwise don't use my phone (no apps, really). I have some widgets running...
I still get about 13-14 hours. I really wish I could get a solid day's worth of use with HEAVY usage.
I'm using a 1600 mAh battery (same one that Chomsky has).