Why Does Iphone Battery Drain When Off. Turn Off Wi-Fi Connection. That just needs a replacement battery.

That just needs a replacement battery. While continuing to hold the OnOff button press and hold the volume down button on the left side of your iPhone. Turn Off Wi-Fi Connection.
Some loss of power over time is to be expected but the reported drain is extreme and can only really be explained by a physical short causing something to consume power.
Of course complete restore as new phone as been done with last ios and battery drain. Several factors can cause your iPhone SE battery to drain fast. I will go to sleep with battery at 100 and turned off holding the power button and sliding my finger. A way that you can confirm this is by bringing your phone.

