The battery in the new 17-inch MacBook Pro lasts up to 8 hours on a single charge1 and can be recharged up to 1000 times2 — compared with only 200 to 300 times for typical notebooks. To do this, Apple engineers custom-designed lithium-polymer cells to create the largest possible battery, then they went even further: They built the battery right into the computer, eliminating the space-consuming mechanisms and housings that standard removable batteries require. The result is a battery that’s 40 percent bigger than the previous generation and offers up to 8 hours of wireless productivity on a single charge — all in a notebook that’s less than 2.50 centimetres thin, weighs just 2.99 kilograms,3 and remains the same price as the previous-generation model.

But building a battery that lasts up to 8 hours is only part of the story. Giving it a lifespan of up to 1000 recharges required breakthroughs in battery technology. Apple electro-chemists developed advanced chemistry that maintains the battery’s charging capabilities longer than ever. And while most notebooks wear down their batteries by charging them at a constant rate, the 17-inch MacBook Pro takes a different approach. Using an Apple-developed technology called Adaptive Charging, a microchip on the battery constantly communicates with the computer to determine the optimal way to charge its cells, adjusting the current up and down depending on a variety of conditions. Combined, these advancements offer a dramatic improvement in battery lifespan: more than three times the lifespan of typical notebook batteries — up to five years.