One of the benefits of having a removable back plate and battery is that you can do crazy things like add more than 3X the 2100mAh battery size for those extended outings.  It just so happens Amazon currently has this 7,000mAh add on for $34 in a variety of colors (Black, White, Blue).

This is the same amount of battery you’ll find in a Typical tablet and as you can see in the video above, pushes the S3 to 4+ days of battery life. On the downside, you now have a brick in your pocket.

Reddit Via AndroidPopo