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Amazon.com: Whizzotech AA/AAA Cell Battery Storage Case/Holder with Charge Reminder Markings Clear Color (6 Pack) : Electronics
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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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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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