Update: The price has now risen to $95.99.
mophie juice pack for Samsung Galaxy S6 – Link 
This was selling for $95.99 earlier on Amazon and has currently dropped to just $69.99 w/ free shipping!
- Impact Isolation System Carefully-designed internal bumpers add extra cushion to the edges and corners of the protective case for unrivaled support
- Pass Through Charge & Sync Provides power to your Galaxy S6 rest before the juice pack starts to recharge.
- Industry Leading Battery Life mophie batteries hold their charge longer than other external batteries.
- Standby Switch Toggle between charging and standby with the imp of a switch.
- Talk Time: Up to additional 21 hours on 3G, Web Browsing: Up to additional 10 hours on 3G, Music Playback Up to 67 hours, Video Playback: Up to 13 hours