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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
Amazon.com: EASYLONGER Portable Laptop Charger, Fast Charging Laptop Power Bank 100W PD USB C 26800mAh Battery Pack for Laptop, Tablet, IPad, Dell, HP, iPhone, Samsung, Android, Switch, and More : Electronics