You never know when that ride will become a marathon or your trip will turn into an endurance expedition; bring the lithium-ion GoPro Rechargeable Battery (HD HERO3 only) as a spare in case you go so big you use all your camera juice or as a replacement when you're running low. There's nothing less pro-like than setting up an epic shoot with a dead camera.

• Have on reserve or replace your dead juice with this 1050 mAH lithium-ion rechargeable battery 
  
• Weighs a mere 1.3 ounces