Okay, got my extended batt in on friday afternoon. Popped it in, and slid the new cover on. I must say, it is MUCH thinner than i imagined it would be, like they couldnt have made it any thinner unless they just used the stock cover. Anyway, to the good stuff. Charged it all friday night. Woke up at 8:30am Saturday and took it off the charger. I will admit that i do not use it heavily on the weekends, i dont stream music or tether. But i do email, play games, read FML, surf the web, text, make calls etc. and i usually need to charge my phone at betime Saturday evening. Saturday i probably spent 30 minutes on the phone, 45-60 minutes on Home run Battle, 20-30 min on the web, sent about 20 texts, 15 min on FML and Funny Jokes, and updated 15 apps. WIFI was on all day, but most of the day i was away from home with no network to connect to. At midnight on Saturday my phone was at 60% Sunday was roughly the same as Saturday as far as usage, maybe only 14 texts, and was on wifi most of the day. At 12:30am i was at 10%, so i used wifi tether to kill off the last 10, i downloaded a large file to my laptop, it made it to 48MB which took about 25 min of wifi tethering at full speed to kill the phone. So while it wasnt heavy use, I did manage to get 40.5 hours out of my battery this weekend, and if i hadnt tried to kill that last bit off, i could have made it to 48 hours as i wouldnt have been using my phone during the night. I am impressed, I will be doing more testing this week, when i am at work i usually keep it on the charger because i always kill it before i go home. Trying to see if i can make it all day without the charger today. Will also be doing a tethering test when i get a chance to get a direct comparison of the batteries. Do a 100%-0% Tether test, to rule out any variables. Forgot to mention, using auto brightness and 1 minute screen shutoff, no other batt saving techniques. Edit:A full day at work and i'm at 50%, that is a great improvement, usually i can kill the battery in a work day. Usage: 34 texts, ~20min HomerunBattle3D, 59% time without signal (main draw of my battery at work) 45 minutes of wifi tethering, 20 minutes browsing web and a total of 1.5hrs with the screen on.