sx350 has several versions, from the original that runs on a single regular 18650 and goes to 60 watts, then they came out with a version that ran on 2 batteries in series for 7.4v and it did 100watts, then 120 I think. then they came out with the slim version which then got temp control eventually and is the J chip. all can run on a single battery except the 7.4v verison of the original chip. the later thin ones can run on one or 2 cells and can run to higher power with 2 cells