If you're looking to power up a small camera or accessory for an extended period of time, Sony L-Series batteries are a popular choice. It's a very common battery used to power anything from small LED lighting, monitors, wireless video transmitters, etc.
Sony L-Series Batteries are also available in a variety of capacities from small to large depending on your needs and are generally inexpensive. Especially if you don't want to deal with the size, weight, and expense of v-mount (or gold mount) battery solutions, you may want to check out these Sony L-Series Battery Mounts from IndiPro Tools.
While there are existing Sony battery trays that can be modified to use in a similar way, there are a few differences with the IndiPro Tools Sony L-Series Battery systems. The first would be the integrated Dummy Battery. No need to purchase one separately and no loose cable connections to deal with.
The IndiPro Tools Battery Mount comes ready with a 1/4" thread and 15mm clamp mount which makes it easier and cleaner when mounting to any rig. The build quality exceeds that of the cheaper plastic battery trays as well. IndiPro Tools has a rubberized coating, lower profile, metal backing plate, and the batteries lock in rock solid with no play.
So while powering your camera and accessories with Sony L-Series Batteries may not be something entirely new, IndiPro Tools has designed a nice solid streamlined product for those that want a more quality solution. For more information about the IndiPro Tools Sony L-Series Battery Mounts (click here).
Other items mentioned
And if you're interested in checking out my previous review about the Swit Sony Replacement Battery (click here).
SWIT S-8972 47Wh Sony Replacement Battery with Meter and DC Out
I'm using lightweight carbon fiber 15mm Rods from PVGear.com, and for the fairly universal 15mm Baseplate seen in the video (click here).
Low Profile 15mm Rod Clamp Baseplate