Well it is a mechanical mod, so I'm sure your usual best bets would be between the AW, Efest, and MNKE series of
batteries, can't go wrong with those. But as far as the KTS goes, I do like the look of it, and people I know who have purchased it don't seem to have a problem with it, so I don't see why not. It's a nice cheap mod to start with and it'll get you going, and should it go wrong, it won't be a pricey mistake at all, but I heard its decent and that the K100/K101 series are much better in performance and durability.