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Pololu - 3-AA Battery Holder
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Keystone Electronics 1029 Battery tray 1x 2/3 AA Through-hole (L x W x H) 43 x 18 x 15 mm | Conrad.com
Battery Holder with Switch - 3 x AA [Battery-Holder-3xAA] - US $0.50 : HAOYU Electronics : Make Engineers Job Easier