I know this is old, but for the sake of everyone being an educated consumer, I'd like to say that I just returned my Seidio battery back to Amazon. I gave it 8 days, starting with full discharges, turning the phone off to charge, and even unplugging and replugging the phone to the charger, while still off, on the 3rd-5th charge. It was not super crappy life, BUT:
1) Battery life was no better than my HTC 1500 mah battery, which is much cheaper. Even if i gained an hour, it wouldn't be worth it because...
2) The battery was always hotter than the HTC, even to the point where I noticed it being warm a few time while the phone was in my pocket. I don't like the idea of something getting as hot as it did sitting millimeters from my SLCD screen. In theory it doesn't really matter, but real life is not a theory room.
3) This one is weird, I admit: When I used the Seidio battery, I got a quiet, but high-pitched tone out of my right-channel headphone anytime the phone put an audio signal into my headphones. whether it was listening to music, clicking a sub-section in the phone's Settings menu, clicking phone digits, whatever. It was driving me insane. Once I put my HTC battery back in, it was gone. Coincidence, maybe...
4) The battery gave off a dangerous vibe. The label that wrapped around the battery wasn't that tight, the battery could be flexed more than the HTC one, and the plastic siding that went around the battery could be slightly moved side-to-side, including the one with the electrical contacts.
5) My back case made more creaking noises as I handled the phone with the Seidio battery than with the HTC battery. Those little things get to me, haha.
So, that is my experience with the Seidio 1750 for the Incredible. I buy electronics to use them, so my phone has HTC Weather updating every hour, Gmail notification as well as Calendar, Google Docs sync, Google Voice, and Google Talk, as well as various 3rd party apps that offer background syncing. I listen to music on my phone with the stock music app, search the internet when I want to, and use my Incredible as my digital camera. Data connection is set to Always On and I allow background data. I don't know what people have their phones set at or what they do with them, but if your Incredible is used like mine...
Do Not Expect 30 Hrs Of Use.
Maybe mine was defective, but I don't care enough. I recommend that everyone should stick with HTC if they can, but if the Seidio works well for you, then don't fix what isn't broken.