There are better batteries than Aspire, and they'll work fine in your mod.
Here's a good introduction and guide to selecting a battery for vaping:
(9) Battery Basics for Mods; the Ultimate Battery Guide | E-Cigarette Forum
18650 batteries have a rating called CDR (continuous discharge rating). It's listed in amps, so it'll be something like "600 mA" or "20 A". Note that many manufacturers and sellers lie about CDR, so it's best to check your battery model's CDR somewhere neutral like Mooch's site, which others have linked to.
A battery's CDR will determine what wattage you can vape at with relative safety. The 'rule of thumb' calculation is:
3 x CDR x the number of batteries in your mod = maximum wattage to use
So, for a 20 A battery in a one-battery mod:
3 x 20 x 1 = 60 w
For 15 A batteries in a two-battery mod:
3 x 15 x 2 = 90 w
A 600 mA battery in a one-battery mod:
3 x 0.6 x 1 = 1.8 w - In other words, this isn't a battery you'd ever want to use for vaping.
Good luck, and if you have any more questions, always feel free to ask.