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3 x AAA Battery Holder with On/Off Switch and 2-Pin JST : ID 727 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Lilypad Power Supply Module AAA Battery Step up to 5V Converter for arduino DIY Kit : Electronics
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LilyPad Power Supply Module AAA Battery Step up to 5V Converter for Arduino| battery charger power supply|battery 10000mahbattery portable power supply - AliExpress
What is the easiest way to power an Arduino Nano from a battery (preferably using the 5V micro USB jack)? - Quora
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