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Amazon.com: 6 AA Battery Holder With 2.1mm x 5.5mm Connector 9V Output 2 Pack by Corpco : Electronics
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Amazon.com: Parts Express Battery Holder for (4) AA with Standard Snap Connector : BH341 : Electronics
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Simple, Cheap, Cool, Waterproof and Gummy Diy Battery Holder : 8 Steps (with Pictures) - Instructables
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