I did the second day of testing the extended battery, with some calls, texting, video from YouTube, games like sonic cd, and riptide, video already on the phone, browsing, running benchmarks, music streaming, between other things, like constant email, and Andy for android.
And I got up to 16 hours of battery life, impressive I must say, I am still cycling the battery to see up to how much I can get out of it.
O yeah phone is not under clocked or anything like that,even though I could I would notice shudders from time to time, so I removed it and is not running any battery saving apps, like juice defender, or battery x2