I have just discovered something that may solve my electric assist problem. (I live in a valley at the bottom of a long hill and, even with a great bike and a lot of gears, I can't get all of the way to the top. Also I am kind of old.)
Anyway check out Ridekick.com. It sounds too good to be true. No dealers nearby in Massachusetts though. It appears to come with an SLA battery with option for LiPo. It is expensive but I am so fed up with the lack of support for electric bikes I am just about to give up riding for good.