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USB Li-Ion Power Bank with 2 x 5V Outputs @ 2.1A - 5000mAh : ID 4288 : $26.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: LHIABNN DIY Power Bank Box Flat Head Battery Charger Outer Case,2 USB Output Ports Plastic Shell Box with LCD Display,Micro/Phone/Type-c Input Port Power Bank Case (Black) : Cell Phones & Accessories
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HGYCPP 3-Port Input DIY USB Power Bank Kit Box Case 18650 20700 21700 Battery Charger Adapter with LED Flashlight for Mobile Phone - Walmart.com
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