[pekk]

Great. So why can't you do it on a MacBook Pro?

[photojosh]

Because they valued more the engineering advantage of a built-in battery: thinness, weight, individually connected cells for power management.

Those attributes of design are more appealing to the majority than are interchangeable batteries.

My MBP and MBAir, even with the single built-in battery, gets more runtime than a 1996 laptop with two battery packs.

[w1ntermute]

Because removable batteries would offend the sensibilities of most Apple customers?