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6 x AA battery holder with 5.5mm/2.1mm plug : ID 248 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Protect Your Power - Slimline AA Battery Case, Soft Durable material - Pack of 2 (Holds 4 Batteries) : Electronics
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4 x AA Battery Holder with On/Off Switch : ID 830 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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