PSA: If your iPhone is having battery drain issues, it could be your Apple Watch

This post is in response to articles I'm seeing with battery drain issues after the iOS 15.2 update. If your iPhone usually gets a day or more of battery life and it's suddenly draining a lot quicker than it usually does, it could be your Apple Watch, if you have one. I've noticed that every couple of weeks or so since I got the Watch Series 7 last Nov, something starts savaging my iPhone 13 Pro Max battery; where I'm usually able to go 3 days easy with light use, it starts draining 25% or more in an 8 hour period. After trying the battery saving tips explain on this article without success, I figured out that the culprit was the watch. (And I've had the same two apps installed on it since shortly after I bought it.) So, try rebooting both devices, and/or unpairing/re-pairing, and see if that clears things up.