[CMeys]

Okay I bought this 2400 maH battery on eBay and I've just tested it agains my Seidio 1500 maH (same size as the OEM) battery.

I used the eBay battery yesterday and after 8 hours of typical usage, it was at 19%.
Using the Seidio one today the same way, after 8 hours it was 10%.

Obviously the eBay battery is slightly more powerful than the Seidio one, but certainly not 900 maH worth -- and IMHO -- not worth it's huge size.

Now, I know that both of those are not very good battery life for my phone, but the way I have it set up (push email, power never turns off unless I turn it off which is rarely, backlight doesn't dim until 5 minutes, etc.) I don't expect great battery life.