Spoiler: It's nowhere near 9,000,000mAh!
The Raspberry Pi might be the name that springs to mind when people think of single board computers for homebrew projects, but there are other boards out there worth considering. (Updated Nov 1, 2016)
VoCore2 is an updated version of the highly-popular coin-sized Linux computer VoCore. Like it's predecessor, VoCore2 is totally open-source, and costs $15. This is a small, low-cost, totally open-source (both the hardware and software) computer that's ideal for projects such as IoT or building your own custom router.
VoCore2 also features an optional camera and dock.
If that's not enough there's a stripped down version of the VoCore2 that's available for a mere $4!
Caption by: Adrian Kingsley-Hughes
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