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No moving parts, no maintenance
Let's see you couple that battery directly to a wheel and see how far that gets you moving before you wish you had moving parts between them. I am looking forward to electric cars being more common but blind optimism doesn't help, the fact is you still need an electric motor and batteries have too small a charge, too short a life and too much environmental impact.
You still have maintenance on the electric motor, you still have a motor and you still have toxic emissions albeit they are now suspended until the battery replacement.
As a European I was horrified to see that prescription medicines are routinely and frequently advertised on television in the USA instructing the viewer to ask their doctor to prescribe the medicine.
They're a great device. A close friend who is an old-school programmer has had his running non-stop since November and now uses it as his permanent *n?x development environment. It's only hobby stuff but he gets to play with GCC and ssh all day.
Colours and words have a more tangible effect on the non-technical.
But don't think I'm agreeing with Tastecicles, because they're almost wrong. They are only the dipped/low-beam headlights as LEDs are not yet legal in the USA or Europe for full or high-beam use. But as for this usage, even SEAT has them now on some of their models and that's one of VAG's "budget" brands.