How can I batch update specific apps? I'm using a rooted Galaxy S5 with Lollipop. I want to update several apps over the Play store at once, but not all of them. Even if I have to use another app to do so, that's okay.
That can be done using AppBrain App Market, an alternative frontend to the Google Play Store. This app a.o. lets you …


exclude apps from updates permanently
skip specific updates (and only be notified when the next update comes)


This way you can exclude stuff from the "batch update" and just have it performed for everything else. You still can update single apps manually. Hint: When using this app, you should disable update notifications from the Google Play Store app, or you'll get notified twice :)

If you like this approach and continue using Appbrain, a suggested additional install would be AppBrain Ad Detector, which integrates here – so you know what to expect before you install an app :)