One thing I haven't seen mentioned yet is that Apple uses some of the smallest cells in the industry. iPhone 8, 8+: 1821, 2675 mAh Galaxy s8, s8+: 3000, 3500

One thing I haven't seen mentioned yet is that Apple uses some of the smallest cells in the industry. iPhone 8, 8+: 1821, 2675 mAh Galaxy s8, s8+: 3000, 3500 mAh That's a huge difference. Apple gets away with this because the iPhone is more energy efficient than comparable Android phones, but that's only on average -- peak energy consumption is still comparable. And when cells age, nominally larger cells retain the ability to drive peak workloads without browning out (even if they drain really fast), while Apple's tiny cells eventually just can't do it anymore.