Clean, simple interior design.

MacBook is as well designed on the inside as on the outside. Turn it over and you’ll notice a seamless, sturdy, single-piece bottom case with no battery compartment. That’s because the lithium-polymer battery in the new MacBook is strategically built right into the enclosure. In addition to providing extra overall durability, this integrated design eliminates the space-consuming parts required by a removable battery. This allows more room for a larger-capacity battery that can run up to 7 hours on a single charge² — all in an enclosure that is just as thin and even lighter. When you remove the bottom case, you’ll discover a clean, simple interior layout that makes it easy to add more memory or a larger hard drive.