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Amazon.com : SOONSUN Standard Waterproof Case Dive Housing for GoPro Hero 4 Black, Hero 4 Silver, Hero 3+, Hero 3 Cameras with BacPac Backdoor for Extended Battery or Bacpac Screen – Waterproof Up to 40 Meters : Electronics
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I tried using an extended battery "L40G4" that makes GoPro's battery last longer than three times - GIGAZINE
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5200mah Waterproof External Power Battery + Skeleton Housing Case With Cable For Gopro Hero 4 3+ 3 Cameras Diving Accessories - Sports & Action Video Cameras Accessories - AliExpress
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