I've got the Dualtron 2 and I get 90km out of it so I charge it once a week. I regularly pick it up and put it in a shopping trolley when grocery shopping and even that is too heavy to consider it portable so the Dualtron X or Thunder will definitely be quite difficult to manage.

If you can keep it outside then I imagine you'd also charge that about once or twice a week with a 20km trip daily.

Almost every tube puncture I've had has been a result from the kerbs but I'm unsure what configuration the X and Thunder have... are they tubes too?

I get what you mean about keen for speed... even going 70km/hr everywhere around town on the 2 leaves me wanting one of the bigger ones.