After reading so much about the 'Monster Battery' of the Samsung Galaxy M31, after using it for a month I am v disappointed. Everything is nice except the battery life between charges. For a 6000 mah battery it goes down to 53% in 13 hrs of light WhatsApp & browsing. This is even worse than my previous phone after using for 19 months & which had a 5000 mah. When I took it out of the box it had only 57% battery life in it & the charger was full of dust. I don't play games on my phone & still this issue. Will try a factory reset & update here again. Looks like I may have landed a bad piece.