One of the great things about Adobe Lightroom is the ability to batch color balance photos. We include a Munsell (Macbeth) Color Checker in every shot. Here's how I color balance using the eyedropper tool.
Open a representative image
Our photographers shoot hundreds of pictures in a day. The camera settings and lighting is always the same which makes color balancing batches of images easy. The color checker is always in the same location.
Zoom in to 100% magnification (press the 1:1 over the navigation)
Select the eyedropper tool
Position the eyedropper and click
You'll want to find a neutral tone. For some reason I find the second lightest square to work best for me. Make sure you are only selecting the grey area. And click. That's it! It's color balanced.
Return the color picker
I kind of wish that once you make a selection by clicking that the eyedropper tool would return to it's original place. It doesn't. Make sure to put it back. If you don't navigation can get a little confusing.
To batch process, select all the pictures (CTRL A) and use the SYNC command.
Select-all thumbnails (they'll be highlighted when selected)
Sync brings up the synchronize menu - I sync all the global adjustments
Once the adjustments are synchronized, you'll see the little +/- symbol in the corner of the thumbnails. This means the picture was edited.
It's a good idea to double check some of the images - just to make sure they look okay.