I thought it was odd that after getting battery level updates for approx every 15% reduction, the last battery update had Huawei at 29%, iPhone 25% and Samsung 26% then no more updates. Why not show when they are at around 10 to 15%? Also, what does "optimum" brightness mean? In a controlled test, all phones should be calibrated to identical levels. Edit: Also Huawei should be set to NORMAL and not VIVID in the display settings. I found this had a significant affect on battery life as well as looking better on the P20 Pro.