mAh rating on batteries

A total newbie question, but something I'd like to know nonetheless.

You can buy AA batteries with a rating of 2300mAh (if not higher), as you
know, AA batteries are quite diminutive in size.

Compare with my laptop's batteries, almost brick-like in comparison, these
are rated for 4700mAh Lithium-Ion

So how can an AA battery, but a fraction of the volume of my laptop's
batteries, have half the capacity?

Or am I missing something?

Thanks


.

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