I would want the voltage under load to be closer to 48v so I would want 4 per series string and to get 100 amp hours at 48v (what I'm going for with lithium right now) I would need 100 of those packs, I haven't seen their discounted price pop up yet, but 100 packs would cost $3165 for 5920 watt hours or $534 per KWH compare to the GBS batteries I have, they are going to cost me $1620 for 5120 watt hours or $316 per KWH, even if I had to pay the non bulk buy rate for the GBS lithium batteries they would still only cost me $484 per KWH and that is a price anyone can get even if they are just buying one pack.
So while RC model battery packs might work well for a bicycle, having 100 packs and 100 connections on a motorcycle, plus needing to figure out a BMS that works with 100 packs and a way to charge them all at once seems like a lot of work and cost.
The GBS Lithium batteries that I bought look really nice, they come packed together in sets of 4 cells with a total per pack voltage of 12.8v at rest, I bought the 100 amp hour cells so a 12.8v 100 amp hour pack weighs around 28.2 pounds with plastic caps on the tops to cover over the terminals, each battery post has 4 threaded holes instead of a single large threaded hole or stud, I hope this becomes the new standard because it gives greater contact area and has redundancy as far as a terminal coming loose.
www.ElitePowerSolutions.com sells a BMS and charger that is designed for these batteries and the BMS is supposed to fit under the cell caps, so all of the electrical connections are protected.
I'm working on a design for a battery box for these new lithium batteries that will be more enclosed with a panel on the side that you unbolt to get at the batteries, having a panel on the side will make the box stiffer and stronger while protecting the batteries in case of an accident and because 4 packs of lithium batteries takes up less space then 6 lead acid golf cart batteries, about half the space for the same usable watt hours.