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Amazon.com: (Pack of 2) 3 AA Battery Holder, 3 AA Battery Case Box Holder 4.5-5V with Cover and On/Off Switch, with USB Cable : Electronics
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3 AA Battery Holder, 3 AA Battery Holder with Leads, 3 AA Battery Holder with wires - ScienceKitStore.com
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3x AA Battery Holder with On/Off Switch and 2-Pin JST : ID 4779 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: 3X 1.5V (4.5V) AA Battery Holder and 9V I Type Snap Batteries Clip Connector Buckles with Cord Wire Leads Storage Box Holders Bundle Spring Clip (Pack of 3) : Electronics
If three AA batteries are wired in series (as in a flashlight) is the result just a stronger 1.5 volt, or do they add to make 4.5 volts? - Quora
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3 x AAA Battery Holder with On/Off Switch, JST, and Belt Clip : ID 3286 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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