My battery lasts normally during the day however I am observing a weird issue where when my phone reaches 15% battery warning. It discharges in few minutes which to me is counter intuitive.
I had phone for about a year. I normally last working day without needing to recharge with 50% left. But sometimes if I am using phone a lot it drops to less. I think problem is not with battery but rather with it discharging really fast after warning. It's as if some mechanism starts using more battery after the warning.
I haven't reset phone since I bought it. I don't frequently get to 15% level though, only noticed this behavior recently, and had phone for a while.
I use normal charging mode and not 'fast charging'.
UPDATE: I had a theory that it's 'power saving' mode that was causing this so I changed setting to switch to it at 5% from previous 15% then drained battery and observed and it didn't matter - once battery got to 15% it discharged to 7% in ~3 minutes.
I am sure it's happening to others, why does it discharge so fast? How do I fix it?