Why are alkaline batteries (AAA or AA) made to be 1.5V while rechargeables are 1.2V?

In practice, alkaline batteries and rechargeable batteries can be used interchangeably in sets. They have only different voltage characteristics.

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Poe - What is the reason behind the design choice to make rechargeable AA batteries 1.2V while alkaline batteries are typically 1.5V?

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