How to model a button cell in CST Microwave Studio?

I want to simulate (and design) an antenna for 2.4GHz Active RFID in CST microwave studio.

There is a button cell near the antenna. Most area of the outer case is anode, that is, the power, not the ground. So I wonder how to model it in simulation software. Is it OK to simply create a metal cylinder? Or the battery is something mysterious in microwave and if I want to get an accurate result, I had better to use an metal case to surround the cell?

Any advice?

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