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All hands on deck! Spudgers at the ready! Disconnect battery!

That was easy. Removal was easy too, thanks to screws and no adhesive to get in the way of battery freedom. Let's see what this pack is packing:

While the 7.6 V, 5100 mAh (38.75 Whr) battery matches last year's model spec for spec, Apple alleges an extra hour of life while watching iTunes movies (up to 10).

This is most likely attributable to improvements in the new Broadwell CPU.

Microsoft promises a similar "9 hours of web browsing" from its MacBook Air killer, the Surface Pro 3. The Surface has a slightly larger 7.6 V, 5380 mAh (42.4 Whr) battery.