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Amazon.com: SDTC Tech 4-Pack 1/2/3/4 x AA Battery Holder with Wire Leads 1.5/3/4.5/6 Volt Battery Case Box Kit for Arduino Project Led Circuit Experiment : Electronics
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Amazon.com: ZRM&E 6V Power Box 4xAA Battery Holder Case with DC 5.5x2.1 Connector Mate with Barrel Jack Connector on Arduino : Electronics
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