Shoot, 2nd time I tried to look up more info on the BMS in the OP, and got my own post as a top hit.
My brother in law gave me a motorcycle (same one as I already have, CBR600), but it had a bad battery. Initially I just used a 6s Ultracap from my other bike, as it had done pretty good before, reliably starting the bike. On one ride though, I accidentally killed the bike and went to restart, but didn't have enough juice.
That got me thinking again that I'd just like to run a straight LiFePO4 battery. I bought 4x 7.2 Ah LiFePo4 cells from Amazon. They are size 32700.
Amazon
I'm going to see if I can get this BMS to work with it, but first I need a spot welder so I can assemble the pack. I've got this on order;
Amazon
It's my birthday this weekend, so nobody can tell me to stop playing with electronics.