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2 Pcs 6xaa 6xaa 6*aa 9v Battery Holder Box Case Wire Dc 5.5*2.1mm Plug Diy Electronics - Integrated Circuits - AliExpress
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Amazon.com: Duracell Coppertop 9V Battery, 1 Count Pack, 9-Volt Battery with Long-lasting Power, All-Purpose Alkaline 9V Battery for Household and Office Devices : Health & Household
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9V battery holder with switch & 5.5mm/2.1mm plug : ID 67 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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EBL 4-Pack 600mAh 9V 6F22 Lithium-ion Rechargeable Batteries + 4 Bay Li-ion Battery Charger - Walmart.com
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