Manufacturers of high quality Lithium Ion batteries. We've tested a lot of cells in the quest to find the perfect replacement for marked-up big brand batteries, and these guys were the pick of the bunch. Able to hold their own and match the performance of other cells used by the caving world, and in many tests surpassing popular batteries in run time, we're glad to have found this company and proudly stock them so that you too can be pleasantly surprised at how affordable a good quality battery can be!