Ok, so I ordered the 1500 OEM battery from igonemobile.com. It was cheap, and I'm not willing to wait for the 2150, nor am I willing to believe the 1750 from Sedio gives the specs they claim. So, I ran a non-scientific test. First I made sure that each battery was in the phone and charging for at least 8 hours overnight while at 100% (green light on, batterygraph says 100%). I turned off all radios but the mobile radio and shut off sync. Then I set brightness to max and turned off the auto adjust. This was to eliminate as many variables as possible. I set batterygraph (the app) to record the battery state every minute. I then started Pandora with a pair of headphones plugged in and removed my phone from the wall charger. I did this at approximately the same time both days (I think there was 1 minute difference). I went through my normal day, but I left my phone on my desk at work all day and just let it play music over the mobile radio through pandora into the headphones. I got 32,400 seconds of play time on the stock 1300 battery. (60 second increments) I got 37,260 seconds of play time on the 1500 OEM battery I ordered. (60 second increments. *I did have to place and receive one call on the 1500 battery. Total call time was ~30 seconds. And I received 2 text messages. Nothing I could do, I have to use the phone sometimes* So, I got a 15% increase with the 1500 battery over the 1300 under the most controlled conditions I could produce while being reasonable. 1300 to 1500 should give a 15.3846% increase, but I'm willing to chalk that up to sampling error or phone call, or text, or whichever due to how insignificant it is. I'm not trying to determine how many AH a battery has without testing equipment. I'm simply comparing other batteries to "stock" rated battery, and making the assumption that 1300 AH is a true figure. If someone would like the data captured by battery graph, please PM me and I'll send it to you. It does appear that the 1500 sold by Igonemobile.com is indeed 1500 AH, assuming the stock is indeed 1300. I would like to see the Sedio figures in a similar test. I'd be willing to do it, however I would want a battery shipped to me and shipping both ways paid for by Sedio (I.e. I'll guarantee that the battery is returned on my credit card, but I don't want to have to pay to ship it back). Or someone who has the 1300 and the Sedio that is willing to do a similar test and give their ratio relative to the 1300 would be good too. I think the best way would be to test all 3 battery's on the same phone, but I don't know anyone who would buy BOTH after markets. Let me know if you see any glaring flaws in the test I did. I'll elaborate if possible, and admit poor procedure if applicable.