What is the average battery usage for Note 4? I feel like it decreases too much compared to before. I was using it to browse the internet, basically Facebook and a few websites, and it decreased like 40% in a little over an hour. I've already tried a factory reset hoping it would fix my battery issues but nothing changed. When I look at the apps and the percentage, Screen takes up the most battery (around 13%) and the on screen time was around 3 hours and 40 minutes. Is this normal? Is this just due to the normal depreciation of the battery? It's been almost one and a half years since I bought it.