There is an informative review in pictures about Mugen 4500mAh extended battery about the size and some additinal techspec issues:
http://www.techpinas.com/2012/02/increase-battery-life-of-samsung-galaxy.html

This battery no longer exists, it has been upgraded to 5400mAh (http://www.mugen-power-batteries.com/samsung/samsung-galaxy-note/mugen-power-4500mah-extended-battery-for-samsung-galaxy-note-with-battery-door.html) which means it is extra 900mAh added to that review.
that is a beast.

very detailed and long review on this one guys:

http://www.youtube.com/watch?v=3FKkK0qNuOw

Highly recommended, this battery is fantastic. I used the OEM 2750 mAh extended battery for a while, which was very good, and then decided to try this. I can get two full days out of it with heavy use, it is a strong performer!

it isnt text and picture review .it's video.My suggest: you can make a text review and add picture.Maybe it attract more people.

4500mAh is huge for anyphone..must be running the phone for atleast 3 days..