Two 9 Volt Batteries Together. The other day I changed the batteries in the smoke detectors for my elderly mom. While you get more voltage you dont get more current.
UncleFred July 21 2011 1204pm 21. Shop Save Today. If you snap them together creating a short-circuit youll get two very hot batteries.
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Ad Affordable Prices Broad Selection Freshness Guaranteed. Connecting a battery in series is when you connect two or more batteries together to increase the battery systems overall voltage connecting batteries in series does not increase the capacity only the voltage. If a metal object touches the two posts of a 9-volt battery it can cause a short circuit. If you connect two 9V batteries positive-to-positive and negative-to-negative the pumps are opposing each other and the battery with more force voltage would pump energy into the weaker one.
