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3 x AAA Battery Holder with On/Off Switch and 2-Pin JST : ID 727 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
4pcs AAA to AA Battery Adapter Converter Battery Holder Case with Metal Contacts on a Blue Bottom - Amazon.com
Amazon.com: Lenink AC Power Supply Adapter for AAA Battery,Replace 2 AAA Battery,Black : Electronics
Amazon.com: HOMEFUNTIME Battery Adapter Converter for AAA to AA Battery Transparent Cases Holder Shell with Metal Contacts on Bottom(Clear Color, Pack of 4) : Electronics
4 x AAA Battery Eliminator Kit
Amazon.com: DSLRKIT 4AAA(LR03) to C Size Parallel Battery Adapter Holder ( Pack of 4) : Electronics
Energizer Battery Charger, AAA and Rechargeable AA Batteries Charger - Walmart.com
Cylindrical Type Plastic Battery Holder For 4 x AAA Battery Converter Box Flashlight Lamp Adapter Case Converter - AliExpress
Amazon.com: Battery Adapter Converter for AAA to AA Battery Transparent Cases Holder Shell with Metal Contacts on Bottom(Clear Color,Pack of 10) : Electronics
Amazon.com: HOMEFUNTIME Battery Adapter Converter for AAA to AA Battery Transparent Cases Holder Shell with Metal Contacts on Bottom(Clear Color, Pack of 4) : Electronics
Energizer Recharge 1-Hour Charger for NiMH Rechargeable AA and AAA Batteries CH1HRWB-4 - Best Buy
4 x AAA To C Size Battery Converter Battery Holder Adapter Box Case Plastical | eBay