Uninterruptible Power Supply (UPS) for BeagleBone Black – a DIY Project | Asterisk for BeagleBone Black
Amazon.com: Gomadic Portable AA Battery Pack Designed for The BeagleBone Black - Barrel Port Connection - Powered by 4 X AA Batteries to Provide Emergency Charge. Built Using TipExchange Technology : Cell
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beagleboard - Questions about the battery management circuit of Beaglebone Blue - Electrical Engineering Stack Exchange