Nautilus X matching CF battery

I currently have the MAXX CF battery + Atlantis MEGA.
I want to purchase the Nautilus X tank (trying to move to MTL and low cloud vaping so I can be less conspicuous), but I'm having trouble working out what battery to select.

I would rather an Aspire CF battery, but it looks like my MAXX CF is larger than the Nautilus X and the CF VV+ is smaller than the Nautilus X - is there really not a matching battery for this new tank?

Can someone suggest an appropriate battery for this tank so I can buy it already?

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