Amazon.com : Waterproof BacPac Back Door Case for GoPro BacPac LCD Screen/Expansion Extended Battery BacPac, for GoPro Hero 3 Original Housing Case : Electronics
GoPro Hero 3 Battery BacPac
Wasabi Power Battery for GoPro HERO3, HERO3+ (1280mAh, 2-Pack) - Walmart.com
GoPro Battery BacPac for Hero 3 Plus | Bikeinn
1 Genuine BacPac Frame mount GoPro Hero 3,3+Plus, 4 for LCD or extended battery | eBay