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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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Amazon.com: Amazon Basics 4-Pack AA Alkaline High-Performance Batteries, 1.5 Volt, 10-Year Shelf Life : Health & Household
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Amazon.com: Kratax 1.5V Rechargeable AA Lithium Batteries 4 Pack Upgraded 3500mWh High Capacity 3A Li-ion AA Battery, 1600 Cycles, Precharged, Constant Output 1.5V, Fast Charging-Charger not Included : Health & Household
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