Here’s how to solve excessive battery drain after the recent Google Play Services update. Google not yet addressed the issue, but there is a temporary solution to fix it. All you need to roll back to previous version of the Play Services (v17.8.57) app to eliminate the problem immediately.

You can download the previous version of Play Services app APK from APK Mirror and install it on the phone. However, note that you need to delete update from the Play Services app to install the old version mentioned above. Also, you may need to disable Background Data (Settings > Apps & Notifications > All > Google Play Services > Data Usage > Background Data) to prevent the app auto update. If that does not work, you may disable auto-update in Play Store. Google may fix the excessive battery discharge issue with a new update shortly. However, you may try the temporary solution given above. Play Services is the core component of Android system. Without it, essential services like Play store, synchronized contacts, user privacy, Google services authentication, app update, etc. will not work. Also, apps may not work if you uninstall it.