The first thing you need to do is to enter Privacy Guard through Settings/Security or Settings/Privacy, then click Advanced or Show Built-In Apps (depending on which ROM you're running). From here you can select Google Play Services and deny the Wake Up and Keep Awake options. This may or may not be enough, if you still suffer battery drain please move on to the next step.
Please note: everything below this point requires root!
Next you need to download Android Tuner. Open it and pull out the side menu, scroll down to the Apps Manager section and select Application Startups. Open the box at the top and change it to All, click the button in the bottom-right until it says System, scroll to Google Play Services and select it, a huge list will open, scroll to very near the bottom and find the Wakeup option, uncheck the box.
Go back to the main menu of Android Tuner and pull out the side menu on the left, scroll down to the Apps Manager section and select Application Manager. Click the right box at the bottom until it says System, scroll to find Google Play Services and long press it, a menu will pop up, select Permissions. This should bring you to the Perms tab, swipe across to the Services tab. In this list you want to uncheck anything that starts with Ads or Analytics, you also want to uncheck anything that starts with com.Google.android.location.reporting as well.
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