Upload & Sell: Off
I purchased at least 3 times BP511 from the 'bay , from different "Chinese" sellers.
I did not ran in any troubles with either of the batteries, all of them being 1800mAh or 1900mAh.
I usually get 1500+ shots on my 5D with these, while i get 800+ shots with canon originals 900mAh.
So thats true power rating, as double the capacity, double the shots. Very happy because they were very cheap.