According to Samsung's official data, the battery life of the Samsung Galaxy S8 has improved compared to the Samsung Galaxy S7. The S8 has a 3000mAh battery capacity, while the S7 has a 3000mAh battery capacity. While the battery capacity is the same, the S8's battery life is improved relative to the S7 thanks to a more cost-effective processor (Snapdragon 835 or Exynos 8895), as well as more optimized software and power management. However, the exact amount of battery life improvement may vary depending on usage, network conditions and other factors.