I have been riding a foldable electric bicycle for a couple of months in the South Bay area of Southern California. Lithium battery. Great on the flats. Gives me (200 lb) plenty of assist on hills, when I peddle without any great effort. I have not checked the range but have been comfortably 15 miles roundtrip with plenty of charge left over. If used for a commute, it would be easy to remove the battery and recharge it in the office.

I have seen two similar bicycles in town. There is now a specialty electric bicycle retail store in the next town, El Segundo. Many people have looked at my bike when parked and/or asked me questions. I think electric bikes could be about to take off. I love mine!

I'm in the South Bay too. You should check out this group. http://southbaycruisers.com/ It's like Critical Mass. One of us has a Giant electric bike too.