Your "now" implies that I didn't know before. That isn't the case. A plug-in hybrid would hardy fit the definition if it had a 1kwh battery more typical of a c

Your "now" implies that I didn't know before. That isn't the case. A plug-in hybrid would hardy fit the definition if it had a 1kwh battery more typical of a conventional hybrid but with the technical ability to plug it in. No more so than the ability to run an old fashioned manual petrol on the starter motor for a few meters made those hybrids. Usain Bolt and a marathon runner both use their legs to move but they are hardly equivalent.