4100mAh refers to typical power capacity. Snapdragon 625 is 20% more power efficient than Snapdragon 650 according to Qualcomm's official website and test results. PDAF focusing speed is up to 0.1s. Redmi Note 4 has 25% larger pixel area than the camera sensor on Redmi Note 3. The data above may vary slightly with different test versions and testing environment.