Ansys Employee

OK. I assume you've used share topology to get a conformal mesh. Turn the battery cell zone to a solid. You may see some warning about internal/interior/walls: resolve those. Add an energy source to the battery and solve. 

There should be (or was) an electronics cooling example/tutorial in the Help system. It's similar to what you're doing, in that a solid is getting warm and the air is then taking heat away from it.