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Weltool UB16-25 16650 2500mAh USB Rechargeable Li-ion Battery
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USB Battery Pack - 2200 mAh Capacity - 5V 1A Output : ID 1959 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Watson Pro 14.4V 50Wh Micro V-Mount Battery with USB VM-50-MI
USB PowerConnect+™ 2 AAA Converter - Convert Battery to Electric
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Square Rechargeable Lithium Usb Battery | 9v 650mah Usb Rechargeable Battery - 9v - Aliexpress