I received today the extended battery I had ordered from England last week. The unit extends the default battery module of 6600mAh by 2200mAh up to 8800mAh. I have not tested it on real life, day to day use, but I am curious how it will perform. The Asus module (6600mAh) performs quite adequetly (not the 7hour blahblah - because I use the bluetooth dongle, wi-fi etc.), lasting around 4h (+/- minutes) for the last 2 months.It is wobbling at the back a little bit and I wouldn't mind if the design was a little bit for "curvy", the monitor does not extend to the back as it did by ~35°, but for 50€ it is worth the money!
p.s.: The battery was used during this evening while I was studying, tweeting, youtubing alot, skyping etc. while having set the CPU at Super Performance (i.e const 1.7Ghz). It lasted for 5 hours and 5 minutes! I will post some average usage and day-to-day stats later this month. I am impressed!
Following is a side by side comparison picture gallery of the default-vs-purchased battery:
