[dheera]

That's only about a factor of 10 from being useful. If you have a 10kW battery, or 10 1kW batteries, you can use that to charge a Lithium battery for a day which will get you 100 kW for 2.4 hours per day, which sounds pretty damn useful for typical urban commuter use.

[nicoburns]

I think it'd be much cheaper to use PV for this use case.