batteries for temp control mods:
Reccommend Sony VTC 3 and 4, Sony VTC5 appears to be only 20W despite 30W constant current claims on reddit.
Alternatives: Sony 25r5 35A 5s pulse with 20A constant or LG HE4
These should work nicely with 160w tc mods like Xcube II or ipv4s
A great temp control would be the DNA box mods, even low power ones like DNA40 are pretty good.
Safety when using Nickel and Titanium is a priority due to hazards like titanium dioxide, so I personally prefer using Stainless Steel
coils on the Xcube2 due to its ability to support SS
coils, and it is much easier to work with than nickel builds