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, Keep Awake, and Auto-Start options. Reboot phone. This should drastically reduce the amount of battery that Google Play Services and Android OS consume.
If you're on a ROM that doesn't include Privacy Guard or App Ops as standard you need to take a slightly different approach. Download this:
Open the app and it should already be in the Activities tab, scroll down to Settings and click on it, that will open up a whole list of different options, scroll down to the App Ops option and click on that, hit the create button at the bottom of the screen.
This is going to add a Settings icon/shortcut to your home screen, click on that and you'll be taken into the secret App Ops section of the settings menu, from there just find Google Play Services and click on it, then disable the Wake Up and Keep Awake options. Reboot phone, no more Google Play Services battery drain.
Please note: If you rely on your location being updated frequently then this method might not be right for you. This method disallows Google Play Services from waking your device every minute to obtain your location and Google Now cards are affected as a result. All other Google services should function normally.
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