While GoKarting at our local track, I was a half an hour into the session when my battery died, and I thought to myself, "Man, I will be missing some epic footage. When I get home, I'm going to put together a rechargable battery pack for the GoPro."
This extended battery pack will let you record for an extra 2 hours give or take. You can replace the batteries of the Tekkeon Battery Pack with more AA batteries. The only downside to this mod is that you will be drilling into your GoPro's plastic case, so it will no longer be waterproof. Other than that, you will have hours of recording time, which means you'll run out of memory before the batteries run out.
USB to mini-USB cable
Tekkeon USB Mobile Battery Charger (Also works with the iPhone, Pod, etc.)
Hot Glue Gun stick
4 AA NiMH rechargable Batteries
Bill of Materials:
Dry erase marker
Hot Glue Gun
Disclaimer: This is for demonstration purposes only. Please use safety precautions whenever working with power tools.