I have a 26650 SX350J mod I built my self. I use MNKE's IMO 26650 gives about 20% battery life than a good 18650 
They take for ever to charge are huge and heavy and just really aren't worth it
IMO dual 18650's are a much better choice
They take for ever to charge are huge and heavy and just really aren't worth it
IMO dual 18650's are a much better choice