USB Battery Pack - 2200 mAh Capacity - 5V 1A Output : ID 1959 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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18650 lithium ion battery pack 2200mAh 5V is rechargeable with USB
UPS HAT (C) for Raspberry Pi Zero, 5V Uninterruptible Power Supply, Multi Battery Protection Circuits
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Battery adapter for AN/PRC-152 provides 5V Dual Output