See apple.com/bw/batteries for more information. Testing conducted by Apple in September 2021 using preproduction 14-inch MacBook Pro systems with Apple M1 Pro, 8-core CPU, 14-core GPU, 16GB of RAM, and 512GB SSD; and preproduction 16-inch MacBook Pro systems with Apple M1 Pro, 10-core CPU, 16-core GPU, 16GB of RAM, and 1TB SSD.