PowerBoost 500 Basic - 5V USB Boost @ 500mA from 1.8V+ : ID 1903 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits

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Adafruit Powerboost 500 Basic 5V USB Boost @ 500mA from 1.8V+ ada1903

Lithium Ion Polymer Battery - 3.7v 1200mAh : ID 258 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Adafruit Powerboost 500 Basic 5V USB Boost @ 500mA from 1.8V+ ada1903

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Overview, PiGRRL - Raspberry Pi Gameboy

VERTER 5V USB Buck-Boost - 500mA from 3V-5V / 1000ma from 5V-12V [TPS63060] : ID 2190 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits

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Power, Converters, Step-Up / Boost Products Category on Adafruit Industries

Power, Converters Products Category on Adafruit Industries

Overview, PiGRRL - Raspberry Pi Gameboy