Connect 9 volt batteries in series without wires - YouTube
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Nine-volt battery - Wikipedia
How to Install a 9V Battery - YouTube
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If you have two 9 volt batteries and add them together, will that make 18 volts? - Quora
What happens if you connect two 9-volt batteries together? - Quora
How to Wire Batteries in Series (or in Parallel) : 5 Steps - Instructables
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