Great post and thanks very much Dick. 

About the YZPower charger that Dick cited earlier:  Has anyone purchased this and did it work OK?  I would like to have a fast charger with me for long rides when I need to give the battery a mid-ride charge.  The 2A charger from Rad takes about 2 hours for each hour of riding and I would like to double that and get at least an hour of riding for an hour of charging.  So I'm looking for experiences with the YZPower charger.
Thanks,