That's very interesting Ian / Jeremy,
I can't see any reference to cigarette lighter adapter chargers on either Anker.com or their UK site, so it certainly looks like Anker may be phasing them out of their range.
As it happens, I spent some time yesterday investigating one of my local aircraft, where one of the owners had reported repeating 'disconnection' issues to PilotAware Support, supported by screenshots from tests he had done at home - with the Rosetta powered by a high power Apple Charger (though he and I both suspect using an inferior power cable), which were showing several Voltage Errors and Throttling Reports, resulting in 'brown-outs' with repeating dropouts of the GPS fix.
After thoroughly checking the unit setup, we reinstalled it back in the aircraft, where it is powered using aircraft battery power from one of the 'newer' alloy Anker 2-port cigarette lighter adapter chargers - like the one you refer to Jeremy - with no obvious issues and definitely no sign of Voltage Errors or the Power LED dropping out during a fairly vigorous 'wiggle test' of the cable and connections, though were unable to test in the air or even ground run the engine due to gusting gale force northerly winds (we were the only people crazy enough to even be at the airfield).
What I did find was that the disconnection issues reported may have been at least in part due to the infamous iPhone WiFi / Personal Hotspot conflict reported elsewhere.
Flight testing in due course is awaited with interest.
Best Regards
Peter