My original battery was dying, screen time with even Wifi dropped from 3 hours to 90 minutes max over the last year. It got really bad last a couple of months, as I had to charge it way more often and the charge cycles got even higher. I tried the Larza 5000 mAh extended but the battery door would not close properly, so I ended up buying the Anker 2700 mAh.
BEST $10 I have ever spent!
Wow and I was about to consider a Note 2, but this battery completely rejuvenated my phone. I am back at 3 hours screen time again, can probably go 4 hours if I stick to reading books/web pages on Wifi. The Anker is quite a bit heavier than the stock battery, maybe that is why it has the juice? I can now comfortably wait for Note 3, or Note 2 refurbish at a DEEP discount.
Expect a 10% increase from OEM, and a much much bigger increase IF you have abused a single OEM battery for the last entire year like I did. It was a 100% increase for me.