The battery is held in place by a few Torx screws.

Although this battery is rated the same as last year's model, it has a different model number: A1405. Last year's 13" battery was model A1377

With a battery like this, the 13" MacBook Air will last for up to 7 hours of constant web use, or up to 30 days in standby.

We'll have to wait to check for battery compatibility between the two generations.