Seidio 2400mAh Extended Battery? Anyone tried it? Results? Mine were AWFUL!

[mlinn]

I ordered the Seidio 2400mAh Extended Battery from mobihand.com. I would have thought this battery would have at least as good a battery life as the factory 1800mAh, and should have had 33% better battery life, but this battery is NOWHERE near as good as the factory battery. It only last about 6-8 hours, and that is not using the phone much at all. Maybe 2-3 short calls, and checking email a few times. I have my email set to check every 30 minutes, but this is the same as I do on the factory battery and it last much longer. Does anyone else have any experiences with this battery or any other aftermarket batteries?

Thanks!