I've set up an instance of Battery 4, 16 stereo outputs and in Battery's preferences, selected 16 stereo outputs, yet when I try to edit a cell, Battery only shows 4 stereo outs, I cant figure out what's going on.
Im using Battery with Logic Pro.
Maybe you can try this.
You can just make 2 same tracks with the same plugin Battery 4,and then make one track go to the L side, and the other one to the right using in-DAW mono/stereo settings.
Or 3 of them if you want a mono track as well.
I tried it with the plugins that don't really support Stereo, and it worked for me perfectly.
I hope it solves the issue.