I stopped using my phone last night with 48% remaining. When I woke up this morning it was dead. Roughly 7 hours of standby time. When I tried to restart it it would just sort of light the screen then go back off. Didn't even show a dead battery icon. Plugged it in and started it. Battery showed 4%. Then it just turns off. Trying to restart it is does the same thing. No dead battery icon, just tries to light the screen over and over. I recorded it where it said 4% then immediately Jumped to 1% then went off. Still didn't show a dead battery icon when trying to start it.
https://m.youtube.com/watch?v=VvmZJTrqgPA
https://m.youtube.com/watch?v=VvmZJTrqgPA