Since I installed 8.1.2 on my 5s, the battery is getting awfuly good. First it started with 5 hours of usage and now I get this. I didn't charge it multiple times, just once up to 100% and than I started using it. I stay on twitter a lot, facebook, safari, messages and sometimes games and the phone is always connected to my wifi. Is this an ios 8 bug or maybe a defective battery that does not indicate the correct %? The phone is bought in march 2014 and I did multiple restores, turned off the phone just to properly calibrate the battery. Sorry if this post is a bit silly, this is not a joke and I am not sarcastic.