I am having a same battery drain issue but in a very different way.. i have been using ios 14.2 on my iphone 7 as well on my iphone SE first Gen. the Battery Drain on iphone SE is very drastic and every 30 Seconds i loose one percent of the battery ... That means if my battery is 100% and i start using the phone or for that matter its kept upside down on the table for every 30-40 seconds i loose one percent on a average.. and at one point it comes to 1% and stays there.. and then i have been using it for 9 hours... that is some thing that started to happen when i went in for the ios 14.2 upgrade from ios 14.1 and when i start charging the same mechanism happens after every 30 % seconds 1 percent + is battery charged.. that is a real weird update from apple this time.. I have done the Clean wipe. Factory reset all Fresh install. Completely drained the battery to calibrate it but nothing worked.. Most surprising part is my battery health is 85% and that is OK to last it atleast 6-8 hours on single charge and that it was doing it before i did the upgrade to ios 14.2 apple pls fix this.... breaking the devices this way is not good.. :(