I've had this phone since Friday, and battery life is the thing that I'm the most disappointed with using it. I'm almost always under WiFi, with good to decent coverage depending if I'm at home or at my University, and I can never get more than 9 hours of SOT, even with light social media use and no gaming (basically only Facebook, RiF, Instagram, WhatsApp and Telegram). If I start gaming things go downhill even more, with the battery going down 1% every 2 or 3 minutes. The only things I have enabled all the time are automatic brightness, GPS on low consumption and synchronization (only Google tho). This is today's usage, with about an hour of 4G and the rest under WiFi. Should I be worried? I've seen people get 10 hours of SOT with a much heavier usage, yet I can't get past 9 with mine.

I'm on the latest MIUI stable, which is 10.0.4.0