EVER stop to think why in some devices, batteries are lined up head to tail while in others, they're placed side by side? That's because power cells perform differently depending on the way they're connected. If they're lined up in a series head to tail, like in a flashlight, the voltage output increases.
When two 1.5 volt cells are connected in a series, the voltage grows to 3. So, in other words, the happy-go-lucky 9 volt battery is really a series of six 1.5 volt cells! Now when cells are lined up head to tail, the voltage may grow, but the capacity, or use life, remains the same as that of a single cell in the series. To increase the cell capacity, a parallel connection is used. That means that anode is connected to anode and cathode to cathode. Two 1.5 volt cells connected in parallel will produce only 1.5 volts but their capacity will double.
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