Here's what I did, and I don't expect anyone to try this. - added a second 1500mah battery on TOP of the original. - had to take the phone completely apart till I reached the battery. - took of the battery out, cut the back of the phone where the battery sat. - put the battery back, which was held by the power contats (for now). - put m-board back as well as everything else. - mounted and soldered the 2nd battery to the oem from the back opened hole. - bought a SLIM plastic case, cut the back so the second battery will go through. -added some leather like material to cover the hole so battery won't be exposed. - polished the leather and phone, charged the iPhone to 100 percent. - voided warranty! End result, yesterday I did the following to test battery life. - bought a Sony BT adaptor (which now I CAN use, had the incase slider before using that port!)- streamed flycast with wifi to the BT headset. - browsed the web reading about the palm pre, watched YouTube videos, played games, did some emailing, watched 25 minutes of eagle eye, downloaded my paid 20 apps(many heavy MBites), and just kept doing things.... After FIVE hours of what I consider HEAVY use NON STOP, the meter showed 65 percent! Btw, my iPhone is jail broken, that's how I got the percentage. Today, battery life got better after a second full charge from over night. iPhone is no longer jb'd so seems to be getting better battery life 7-10:45 of heavy use and battery meter just moved a TINY bit. Best mod I have done to a phone. Did this to my bb bold as well. That thing lasts like forever with the small screen. I will post pics of the iPhone tomorrow incase your interest in seeing it. Btw, I know people will say I should not have done this to the iPhone with piggy back batteries. But I have done this many times with absolutely no problems at all. The iPhone feels like I'm holding a regular iPhone but with brut battery juice. Just wanted to share.