If it were me I would probably get a 20 amp CDR battery. With a 3 cell mod in series. (voltage adds), when the cells are completely drained (lets say 3v each, really it will be before that) you would have 9v total. Take that voltage and multiply be 20 amps and you get 180 watts. Are you planning on using more than 180 watts?
The thing is the higher the CDR, the less the capacity of the cells. Most regulated mods have an input limit. Match the CDR of the cell with what you will draw so you don't sacrifice capacity.
I really don't know where you can get guaranteed authentic VTC4's. I use 20 amp cells because I use regulated mods. Even though both the Samsung 25R's and LG HG2's are 20 amp CDR cells. I use the HG2's when I'm not pushing the mod as hard and the 25R's if I'm pushing it harder.
EX: I use the HG2's in my dual cell mods because with my power requirements I'm never pushing more than 20 amps. I use the 25R's in my DNA75 because with only one cell, I push it a little harder.
Samsung is known to be conservative with their ratings. If you look at tests the 25R's heat up a little bit less at 20 amps. The higher the CDR, the less capacity and vice versa. Match the cell to the application.
If you really need 30 amps, then check out some of the vendors in the article I linked you too. I'm telling you what to do, I'm telling you what I do.
Here's the link:
Reliable Battery Vendors
It’s important to buy from well known vendors who only carry authentic batteries. There are a lot of fake, “counterfeit”, batteries out there that not only perform badly but can be dangerous to use. Here are a few reliable sources for authentic batteries:
In the United States:
Cheers,
Steve
