The battery drain has gone from bad to worse on my iPhone 6S ever since iOS 13.1.2 was introduced. With iOS 13.2.3 the battery has drained from 100% to 1% in 2 hours without the phone being used at all. If I turn off the phone when the battery is at 100% and then turn it back on, the phone will flash the low battery warning and then go dead. Once I plug it into an electrical outlet, the phone will show that it is charged 100%. The same thing happens if I reboot by pressing the home and power buttons simultaneously. These iOS updates are destroying the battery. It was at 96% capacity when the problems started. In one day it dropped to 95% and then a couple hours later to 94%. I have gone to the Apple store and called telephone support. The employees act like I am the only one with battery issues. The employee at the Apple store told me to recalibrate the battery by letting it discharge completely before recharging. If that didn’t work, then restore the phone. If that didn’t work, then buy a new battery. If that didn’t work, then buy a new phone. Seriously? Is this the advice Apple is training its employees to give?