I have the Nightwatch NSX4 in 26800 format. It is my brightest by a margin pocket rocket “Cargo Pocket Rocket” light. You supposedly get 11,000 lumens at 35 amps with the 26800 cell, instead of 13,000 lumens at 45 amps with the Samsung 30T. I found the cells sold in the USA for $4.75 each. 26800 Lithium-ion battery I use the Olight Universal Battery Charger. In hindsight I’ll give up the 2000 lumens at 10 amps for that longer turbo runtime. I’ve got 5 of these cells and like their performance so much that I’m cutting 2 Convoy L6 tubes into single 26800 cells for a couple of Convoy M3’s.