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USB Battery Pack $36
The Raspberry Pi is powered by a Micro USB port, just like nearly every cell phone charger on the planet. A ton of manufacturers realized a portable battery pack able to charge a phone is a good thing to have and they have put out quite a few lithium-ion USB battery packs able to charge a cell phone, tablet, or power a Raspberry Pi. If you or someone you know is looking to take a Raspberry Pi off the grid, these battery packs provide all the hardware and equipment necessary to make that idea a reality.