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Amazon.com: 1 to 2 Type C USB to 1.5V 3V 4.5V 6V 12V Adjustable Voltage AAA AA Battery Eliminators Replace 1-8pcs 1.2V or 1.5V Batteries for Radio LED Light Toy Keyboard : Electronics
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Wiring Batteries in Series & Parallel - Increase Your Capacity - Wire 2 6V Batteries to 1 12V - YouTube
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