This happens to be the best stock battery in a phone aside from the Droid RAZR HD's sibling, the RAZR MAXX which features a huge 3300mAh battery. (androidheadlines.com)
The Samsung Galaxy S3 will be the first Android phone to have a custom - built Mophie battery pack, which we're told will offer approximately double the capacity of the phone's 2100mAh stock battery — although design and specs for the device still aren't finalized. (androidcentral.com)
The extended battery has a capacity of 2760mAh (as opposed to the 1700mAh stock battery) so it should significantly improve the phone's time away from the charger. (ubergizmo.com)