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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12 Best Rechargeable AA and AAA Batteries of 2024

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Voltage: 1.5V (about 1.6V when fully charged), Capacity: 3000mAH, Cycle times 400-500, Type: Alkaline, Color: green, Size: 18*68 (mm),

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