GoPro Hero4 Black as an Event Camera

My latest toy tool is GoPro Hero4 Black.  I plan to use it for capturing ambiance and the event audience.  Unfortunately out of the box the camera is not particularly suitable for this task.  Main culprit is a short battery life.  I need at least 2 hours of uninterruptible operation.  I think by now I have a package which should deliver on my requirements:

• Regular battery - no changes.
• Border frame housing.  Better yet the one with a hood!
• Tripod mount.
• Power supply cable.  This pretty much precludes use of waterproof housing.  Even some open frame housings may require modification.  Here is why you would want to pay $20 for this cable instead of using the miniUSB charge cable you already have..... When fully charged the camera will stop drawing power from the power supply.  If an external battery is used (like I do) this will force the external battery to electronically disconnect.  Hence charge cable is not good enough.
• 4x Sanyo 3.7V 2600MAH UR18650ZY 18650 rechargeable batteries.
• 18650 Battery Case with charger circuitry. 
• 64GB Micro SDXC card.  UHS-1.  I will try this one. 

With the above setup I expect to be able to perform 2 hours uninterrupted video recording!
Not to forget!  This gadget proved to be a must-have while troubleshooting the setup. It just shows USB power voltage and current.  And, finally, do not forget to set your camera with a Protune flat color profile. I use it in 4K 24fps mode.

PS: To remove barrel distortion so prominent in 4K I successfully used Sony Vegas deform filter.  Does the job!