[hayden55]

Yup cycle life is a tough one. It looks like the LG cells may get 60% of the cycle life of the Panasonic cells that the table is based on. Also, those numbers are with mild temps ,0.5c charge, and 1.0c discharge.
I finally bought my batteries last night. Going to build a 15s7p pack. Cells ended up being $90.54 (86 cents each).
I definitely say I will get above 1000 cycles, but it may be more based on this chart:
Capacity End V Start V Cycles Usable kWh
100 3 4.2 300 982.8
88 3.072 4.128 4500 864.864
84 3.096 4.104 9000 825.552
80 3.12 4.08 15000 786.24
60 3.24 3.96 21000 589.68
40 3.36 3.84 24000 393.12

I am interested in building my own programmable BMS with an Arduino and some relays, temp sensors, and an ammeter. I would be able to program in all my limits on voltage, amps, and could try out the dump load as well. I can even do some dip switches that swap the program to/from each capacity level for prolonging life. (ie: switch combo 3 = 30to70% capacity range limit) Dump load probably just to do the braking and not charging though. Maybe later.
But we are discharging harder in a hotter environment. Past that I only have a lot of fuzzy math since I don't have any motor curves to work with. I have noticed the motor only achieves so many RPM/Volt so it will be interesting to see how fast we go and how far we go. I ended up spending $40 on the bike so If I decided to sell the bike I wouldn't lose much money if it ends up being lame and slow. Then I could keep my battery for other projects, and sell the rest.
*also the motor has a limiter disable wire.

So far:
$40 - bike
$90.54 - battery cells
$196.15 - 1500w voilamart kit 26" rear wheel

By the way I appreciate all the feedback and advice everyone. Having a lot of fun so far doing calculations and planning config/testing.

Hoping this will turn into a 40 mph e-bike on a new frame with all the safety hardware to be legal.