So I have a phone with a non-removable 4k mah battery and I already have it for 5 months now. When I first got it and after a couple of days of honeymoon I'm pretty sure that I'm cracking the 11 hour screen-on time. My question about is how does battery detoriates? I installed Gsam Battery a week ago and it logs my average screeon on time at 7hr and 43 mins but I have this habit of charging my phone when it reaches 40-35% of battery so if I fully dischargr my phone to 0 then I should still be able to reach 11hrs of SoT. Isn't it suppose to be lesser now since I'd been using it for 5 months now or does battery only starts to detoriate when let say it reach x charge cycle and the battery will starts to get small like a meteor entering our atmosphere?