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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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Power Bank 18650 Battery Charger Module Dual Usb 5v 1a 5v 2.1a Output Micro Usb 5v Input Lcd Display Indicator For Smartphone - Integrated Circuits - AliExpress
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