Battery drain when battery is below 30-40%
Hey guys. I don't want to beat a dead horse when it comes to the iPhone 4s battery life and I actually don't even have any problem with that issue. I can get close to 2 days of standby with ~4 hours of actual usage. But one thing I found weird was that my iPhone loses battery life rather quickly overnight when the phone has less than 30-40% charge left. I would go to sleep with 29% battery life, and wake up 7 hours later to find that the phone has 4% charge left. This has happened 3 times now. I've already discharged/fully charged the phone a couple times after I got the phone 3 weeks ago. I also remember to close all apps before going to sleep.
Since this has happened multiple times, I've decided to charge the phone overnight. It's just something I found strange. Has anyone else noticed this?
(BTW, my phone stays at 100% for quite a while before going down to 99%, whereas the 99% to 98% is pretty quick)