Welcome to the forum
@Nergala
As
@Superuser187 has highlighted, there are quite a few 18650 batteries that will work fine for your mod. The important area of your battery is the CDR value of the battery (20A, 25A or 30A). This is the rating of a battery that determines the maximum output (power) that the battery can deliver at any one time.
Its a trade off with all batteries, the higher the CDR value then the lower the mAh rating. This mAh rating specifies how long the battery will last before it requires recharging.
Because your mod is a high powered device i would recommend getting the highest value CDR that you can get, especially if you vape at high wattage. This will be typically 25/30A. If you only ever vape at low wattage, you can use lower CDR value batteries which means you can get higher mAh batteries which will last longer between charges.
A good calculator to check the safe operating condition and the correct value batteries needed for your vape set-up is
Battery Amp Draw / Drain Calculator - Vaping Hardware
Also worth mentioning, when using dual battery mods, ALWAYS only use matched/paired batteries. This is 2 identical batteries of the same type and rating and only ever used together.