I don't see them say anything about using them on the Wowtac website so I would say you are risking it over driving the LED or the driver and causing it to fail. Or it could work just fine...I don't own that model myself.
I don't have this light but it is on sale in the two versions on my Amazon - I have both on the wish list.
A2 and A2S are both sold with a 18650 rechargeable battery.
Difference is that in the more expensive A2S version there is a 3400 mA battery (in the basic version there is a 2600 mA battery)