2JNT's Pilak TM and Pilak V2 are made of 100% solid 0.925 silver (Sterling) and has the same IACS (International Annealed Copper Standard) rating as OFE copper (oxygen free copper) which is 2 points higher than pure copper (102). Standard pure copper has a IACS rating of 100. The contacts and springs (two in each switch) are also solid 0.925 silver. The MCV Silverback is also made from 0.925 solid silver and the contacts and springs are made the same way as the Pilak's are. NO tube mod is more electrically conductive than the solid silver mods from 2JNT and MCV. PERIOD. Low resistance and high conductivity are king and NO metal does it better than silver. Batteries have NOTHING to do with the efficiency of a mod or for that matter, ANY electrical circuit.
That said, there is ONE exception. In 2014 Caravella made a VERY limited run of PURE (0.9999) solid silver tube mods. PURE Bullion silver is the best electrical conductor on the planet with a IACS rating of 108. Nothing is better. The problem is that pure silver is super soft and as such, these mods were never meant for daily use because the threads would deform pretty quickly even if you were super careful. I think they made fewer than 50 of these mods and they sold for about $4000 each. Needless to say....they are shelf queens and not daily drivers. I only know one person that has one. It's beautiful but it has never been used.
I have both the Pilak TM with a HARI RDA (24.8mm) and the Pilak V2 Hybrid (22mm) from 2JNT. I also have a MCV Silverback. All four pieces are made from 100% solid 0.925 silver and will outperform ANY and ALL non-silver mods. No exceptions.