Generally speaking, you'll want an 18500 / 18490 (same thing) with a kick in a mech mod. Got a link to what you actually bought?
If this is me you are replying too then this is what I now have:
Aqua Rebuildable Atomizer (Clone) King Clone Mechanical Mod Sigelei Kick (5W - 10W) to add Variable Wattage to your Mechanical Mod Nitecore Digicharger D2
@Butters started
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Generally speaking, you'll want an 18500 / 18490 (same thing) with a kick in a mech mod. Got a link to what you actually bought?