Very curious that Apple decides to equip a battery with more capacity in a terminal of a lower range, and this has taken everyone by surprise after the breakdown that the iFixit cracks have made.
How is this possible? Well basically because the battery weighs 7.5 grams more, weight that has been used to add 350 mAh to the battery, something that compensates a lot. And in case you are wondering, indeed: the battery is compatible with the MacBook Pro launched recently.
Let's hope Apple does like the first unibody MacBooks and upgrade the battery of the Pro models to at least equate it to the low-end model, otherwise it would not make sense.