It
looks like a LiPo pack. (3.7V, 3300mAh, max discharge unknown!)
I wouldn't even try unless you know someone knowledgable who can advise from experience.
Look at it this way, for the value of the
mod, the hassle and price of getting the correct pack.
You then have to install it correctly.
At the end of that, it has to be 100% safe.
Be easier and safer to just get a mod that takes 18650's and know that
batteries are easily sourced and replaced.