First, the setup of Battery to a drum rack is explained here:
https://www.ableton.com/answers/how-to- ... -in-live-9
This works for Battery 3 also as that is what I have with Komplete 8
That will allow you to place Battery inside a drum rack and now have the 16 pads triggering all the battery cells with the ability to scroll through the cell groups. Next, to create the Multi-Outs (if you would like to send different cells out to different tracks in Ableton):

- Create a new Audio Track and in the I/O settings, just set the "Audio From" to come from the Battery Drum Rack channel
- In the Audio From option set the channel to receive the audio from Battery (Such as 3/4)
- Set the MONITOR setting for the sub channets to IN
- Now all drum cells will transmit on the default 1/2 channel from the main track but if you select a cell and then use the OUTPUT option to set a new audio output it will rout to the new channels you created.

- Create as many output channels as you would like and then Group them together with your drum rack
- Place any compressor/global FX onto your group track and you now have a complete Battery multi-I/O kit. Save as a new device in your user library and call on it anytime.
Now you can use all your Battery content and track it just like an Ableton kit PLUS mix the elements as you would normally. This same process should also work for many other VST drum instruments or sample players.