Today NPR did a story on e-bikes. I understand an e-bike is one with a variable boost to the crankshaft supplied by a battery-powered electric motor. I also learned this boost can be helpful getting over hillls without losing speed. However, I have never seen an e-bike nor a picture of one.
My questions are:
(1) Can an electric boost be added to my recumbent bike, or is an e-bike something that has to be bought and used as-is?
(2) How much weight would such an electric boost cost me?