Ah, I see, some colors in the 650mah X2 batteries are not available for the moment in an automatic - like black, damn. But at least silver is, so that is something. According to the Volt website, the X2 650mah batteries are 72mm in length - which would seem to me to be shorter than a Volt Spinner 650mah at 110mm in length. 72mm sounds more like it to me, so I may have to pass on the pricier and longer Volt Spinner batteries and maybe give the X2s and X2-T3s a try.