Okay your wattage needs should be covered, meaning that a 3 battery mod with the Sony batteries will let you get to very high wattage safely. I can't give you an exact number I'm not a wattage guru, or battery guru, but I'd say you'd be fine at over 100 watts, if that is your desire.
I'm going to link you to a couple battery guru blogs though, you can check there. The main problem I see is you bought from Element vape, and while I find them to be a great company the only known way to avoid rewraps (people taking a lower rated battery and rewrapping it to look authentic) is to use trusted, approved suppliers. Mooch's blog has a table listing those suppliers, and if in the US, any vendor listed should be fine. (It's in the last cell of the chart, along with actual tested ratings.) I would link the chart but I always fail. On Baditudes blog (also a great battery resource) you will find recommended batteries for specific wattages.
Note that I'm not saying those batteries ARE rewraps, and even if they are well IDK. I will merely state that the only way to be 100% SURE is by buying from a trusted vendor. I use IMRbatteries.com and I love them. I use them exclusively unless they don't have a battery I want. Also, if you are outside the US, say where you are and I'm sure someone will be along to help.
Some light reading (you don't have to do it all/all at once!) Do you know around what wattages you think you'll be using? If it's lower, I'd say perhaps it may be safe to use your batteries and honestly Element Vape is a good vendor I just don't play around with batteries. Ever. They are the single most important safety issue in vaping if you ask me. Since your mod is regulated, most likely if the batteries are rewraps and the wattage is too much, you will likely not get the mod to fire, and/or get dreadful battery life (a sign they MAY be rewraps) and ultimately a regulated mod 99.9% of the time won't fire, etc. I so don't want to be the 0.01% of people whose mod does something a bit more exciting but not in a good way.
Good luck and happy vaping!
https://www.e-cigarette-forum.com/blogs/mooch.256958/
https://www.e-cigarette-forum.com/blog-entry/baditudes-blogs.7609/
Anna