It is an interesting advance (and one far beyond my technical ken) but the main point that stood out for me when this was first posted on HN a few days back is

It is an interesting advance (and one far beyond my technical ken) but the main point that stood out for me when this was first posted on HN a few days back is the so far untested longetivity of the system, with it so far only having been tested for 150 dis/charge cycles. This doesn't at all preclude improvement, but the military's needs and budgets don't necessitate very long-life uses, unlike consumer items - especially expensive battery on wheels items like cars. Here's hoping though!