The cells of the new 11-inch model's rechargeable battery module are divided in six areas. The module uses three sizes of cells.

"Probably, Apple wanted to install as many cells as possible in a limited space," an engineer for a PC maker said.

6 laminated cells
A module made by combining three sizes of laminated cells (a). Its thickness is 6.3mm at the thickest part, which is thinner than the thickest part of the first model's battery module (6.8mm). The new 13-inch model uses four cells of the same size and has a capacity of 50Wh (b).
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Furthermore, smaller cells have higher yield ratios and higher safety. And their costs can be more easily cut. The cells are manufactured by Hongkong-based Amperex Technology Ltd (ATL) of the TDK Group. ATL supplies cells for many of Apple's products including the iPad.

Commitment to good design

Holes invisible from front side
The new MacBook Air has an LED lamp that is lit when the camera is in use. But when the light is off, it is impossible to see holes from which the LED light comes. It seemed that the surface is processed after resin is flowed into the holes. (Click to enlarge)
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We were impressed by Apple's commitment to good design while seeing the LED lamp that is located on the decorative laminate around the display and is lit when the camera is in use.

When seen from the front side, it is impossible to find holes from which the LED light comes. But when seem from behind, there are many holes through which the LED light passes. The holes are very minute, but they do not penetrate through the decorative laminate probably because resin is used to half-fill them from the front side.

"It is not possible to flow resin through such tiny holes without vacuuming," an engineer said.

It seemed that the surface is processed after resin is flowed into the holes to make the surface flat Note 3).

Note 3) A 0.4mm-thick aluminum plate is used for the decorative laminate around the display. Only the peripheral part of the decorative laminate was thinned down to 0.2mm, and a rubber gasket was attached to it. While being committed to good design, Apple seemed to have made thorough efforts for slimness.