That's not what Dave says. Batteroo has shown a prototype and I have no doubt that they could come up with something that works it is just impossible to get the performance they claim.
Let's be real about this.
Batteroo could have and would have shipped this ages ago if no one had kicked up a technical stink about it.
It would have been a piss-poor product that didn't get close to their claims, but that wouldn't have mattered because the placebo effect and customer confirmation bias would have kicked in and they'd have countless non-technical customs giving it positive reviews.
It's because they have been called out on their BS claims that there has been delay after delay, because they have no idea how to ship anything now that wouldn't get torn to shreads in the technical media now that they are on the radar. Not that they can, they know very well that anything they ship won't come close to their claims.
Even if they were technically incompetent (through lack of effort or whatever, because these are smart guys) or delusional enough to think it could have worked before, so much data has been shown to them that blows it out the water, and they are smart enough to know that now. The game is up.