8000mAH
http://www.mobilecityonli...il.asp?productid=27871

Make sure to toss Advanced Task Killer Froyo if you have android 2.2. That helped mine, also make sure to go into the settings and make sure your screen is not at it's brightest and turn off different features you might not use. I have the HTC EVO, if I use my fully charged phone for about 2.5 hours talking it will be at 5% battery life in no time. My battery is only 1500mAh, so you should be doing better than my phone at least.
 
Or you can root your phone, many people that have rooted their phones have seen 200-300% increases in battery life after getting rid of all the bloatwear.

check oout juicedefender on the market
 
https://market.android.co...atedroid.juicedefender
 
the main feature is it turns off your data when your screen is off and nothing is downloading, i love it!
 
there are also tiered paid versions with extra features