The incorporation of the Intel Core M chip, with its 14 nanometer process technology, does more than ensure energy efficiency with excellent performance. Consuming just 5W of power, it produces less heat, thus eliminating the need for a fan or heat pipe. So your Macbook works silently through all your tasks. OS X features like Timer Coalescing, App Nap, etc. ensure zero power wastage. The Apple MLHA2LL A MacBook Laptop battery has a capacity of 41.4Whr and becomes a powerful component, supplying the energy required to keep you up and running for hours at a stretch on a single charge.