iOS 11 is causing massive battery drain problems

In my case the excess battery usage has been all Apple Maps, according to the battery usage report.

What’s more likely is each new phone is significantly faster and more efficient than previous iterations. Thus, new software designed for “current” devices will run dramatically slower on a device even two years old. Fun fact, the most intense gain being made in processor tech is by apple and their SoC tech. Each new A series chip blows away competition to the continued amazement of most.

However, I agree that if you do install that final OS update, it tends to make performance terrible. I regretted installing iOS 10 on my iPhone 5; and the unfortunate thing was that there was no way to downgrade.

I've experienced this almost every year.

So - don't attribute to malice what can be explained by a rushed release.

The watch is especially problematic as I am using it to track various activities and it is harder to charge (who has a watch charger in their car?) and can’t be used while charging.