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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Your usages of rechargeable 1.2V Ni-MH or 1.5V Li-ion AA/AAA batteries?

Charging Cell Type: NiCd, Ni-MH,Alkaline,LiFePO4 14500 10440. Capacity: AA:1600mah / AAA:700mah. Compatible : AA, AAA. Battery P roduct M anual.

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

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