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2 x AA Battery Holder with Knife Switch : ID 3951 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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4 x AA Battery Holder with Premium Jumper Header Wires : ID 3859 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: LampVPath 6PCS 18650 Battery Protective Sleeve, 18650 Battery Spacer, 18650 Battery Holder Converter for 18650 Battery (Batteries are not included) - 6 Pack : Electronics
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