I have a corporate iPhone 7S which is only 1 year old. Prior to installing iOS 14, I could leave my phone plugged into the USB port of my PC and have it trickle charge while I worked and while I was on conference calls over bluetooth. Since installing iOS 14, as soon as I plug into the USB port of my PC, the batter percentage begins to DROP drastically; faster than if I were to not have it plugged in at all. When the battery gets to 20%, the charge cable appears to hold the life at 20%. It will fluctuate between 19% and 21%. I have observed this for 2 straight weeks while I've struggled with this issue. I have never left work to go home with more than 20% of battery life even though it has been plugged in. Turning on or off battery optimization makes no difference. I have tried different USB ports on my PC with no difference. Before the iOS update, I didn't have this issue. If I plug into a wall jack, it appears to charge normally.