Lastly, just being frank (but don't CALL me Frank! lol), I think you have been lucky, so far, with your BlackTip. My gut feeling is that they are not just less reliable than a Genesis/Seacraft/Suex. I think they are an order of magnitude less reliable. Which is just my way of trying to say they are not just a bit less reliable as a cost compromise. I think they are fundamentally less reliable - at least, when using power tool batteries - in a way that, because of my experience with mine, means I simply would not use it for some dives where I would use my Genesis, even though the depth, thrust, and runtime required are well within what the BlackTip can do.