It seems there is/was a 576Wh battery version of the S5 as well as the two smaller versions (see attached image).  I really liked the idea behind the i5, I wonder if @Jason McNeil is going to carry the S5 as well, and in this larger capacity? I don't see any mention on ewheels.com yet. http://www.iamips.com/s5/ https://ipselectricunicycle.com/s5/