I charged my brand new iPhone 6s overnight on Saturday to 100%, and used it normally on Sunday. About 5pm the battery was at 44%. Checked again at 8pm after using it some more and it was still at 44%. Realized something was fishy so decided to drain it completely overnight to 'calibrate' it. Woke up this morning and it still said 44%. Did a hard reboot (power button + home button) and it booted back up to 52%. Used it today until it died, and charged it a little bit at work, to 11%. Watched it for the next couple of hours and it stayed at 11%. Did another reboot and this time the phone wouldn't boot up at all, it gave me the connect charging cable animation on the screen. I plugged the phone in for a minute and it rebooted itself to 2% battery. Unfortunately, after only 3 days of use I don't trust this battery at all. Anyone else notice similar behavior on a new iPhone 6s?