Have been happy with the Imren 26650's for me mechs. For the T6, I use Sony's and my single MNKE, since it only goes 14 amps max. With a dual 26650 mod though, would use the Imren's since the have a decent continuous, ~40 amps and a decent mah rating, 3600. Which box and max amp output are we talking about. That would have a major impact on batt choice.