I've got a 6s with the N71AP CPU. I get false empty battery crashes, every day. The phone usually restarts after connecting to a power source, but if I'm out and about with no access to power, I'm without a phone until I can plug it in. Today, for the second time, it crashed and did not respond when connected to a charger. I connected it to the Mac and still got the dead battery screen. I pressed the home and power buttons, without result. I just pressed the power button and the Apple screen came up revealing that I have a fully charged battery - fat lot of good that's going to do me, when it crashes again.