Why do most electronics that run on two batteries require you to have them facing alternating directions?

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Why do most electronics that run on two batteries require you to have them facing alternating directions?

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It makes the wiring easier. The circuit starts at one end, runs through the first battery and across to the second battery, and back through the second to complete the circuit.

Each side has a different charge, and to power the device the circuit has to be complete. The energy flows through the batteries (I believe the negative to the device and back to positive, negative, positive, negative, and complete the circuit). It’s basically like a one way pipe that only takes certain electrons as electricity and doesn’t go backwards.

batteries come at fixed voltages (1.5v), however most electronics need higher voltage to function.
You can stack batteries to increase the total voltage supplied. It is mechanically easier to build the stack when the connecting sides of the batteries are already laying close.

The batteries are wired in series. The positive terminal of one battery is wired to the negative terminal of next battery. If I connect two batteries in series I have doubled the voltage in the circuit while maintaining the same capacity rating (amp hours).

If the batteries were facing the same way, they would be parallel. The positive terminal of one battery would be wired to the positive terminal of the next battery, and the same for the negative terminals. If I connect two batteries in parallel I double the capacity (amp hours) but the voltage is unchanged.

There are 2 ways to wire batteries into a circuit: in series, or in parallel. When 2 batteries are wired in series, they create more voltage (the force of electricity), but with the same capacity. Connecting the batteries in parallel doubles the capacity, and keeps the voltage the same.

Batteries in series would have one of the batteries connected to the working components at the positive end, and another connected at the negative end. Other batteries could be connected directly terminal to terminal, or by a metal plate, which could be placed in the end of the device, away from all the buttons and other functional parts of the system.