Why do batteries have different voltages?

Answer:

Between the positive and negative terminals of a battery voltage exists. Since the flow between both poles runs through the device, the product must be adjusted to a certain voltage; otherwise the unit will not work. The most famous batteries are the 1,5 Volts. Some deviate slightly from this battery type. Especially with button batteries (e.g. lithium 3V) the difference in voltage is of influence on the malfunction or failure of the device. For rechargeable batteries, which have a lower voltage, this is not a problem. A similar alkaline battery (non-rechargeable) begins with 1,5 volts, but this will drop below 1,2 volts after some time of use.

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