These are going to be my first 26650 batteries that I'll ever have used. The only thing I'm concerned about is the 40 amp cont. 4200mAH battery. There isn't a single 26650 that compares to the Ijoy brand batteries. I'm guessing the amperage is closer to 34 continuous and more like 3800mAH. However, I'm sure it's still more power and apparently longer lasting than 18650's. I'm buying this mod with included pair of those 26650's. While they charge for a bit, I'll have Sony VTC5A's and LG HB4's whichever is appropriate for the tank and coils I'll be using at that time. HB4's have the most beastly wrappers and I've ripped most batteries eventually but not those. It's as if the wrapper is not wrapped. LOL But the ideal voltage remains throughout the charge longer than HB6 pinks, if you can believe it. The VTC5A's are perfect performers and last very long. But I'm thinking I might buy another pair of Ijoy's 26650's after I hear from somebody their own experience with them. If anybody has the mod, please briefly help me out? thanks in advance.