How about 18650 Li-Ion battery pack over the Li-Po packs?

thought I’d post this here. Vruzend / Micah Toll has his 18650 diy Li-ion battery building kit upgraded to a version that supports higher current (due to nickel plated copper bus-bars).
See the kickstarter here: DIY Li-ion battery building kit | Make your own 18650 packs by Micah Toll — Kickstarter

I am seriously thinking to go ahead with this route.

Can anyone confirm that my calculations are correct, see below?

taking this cell LG HG2 18650 Battery, 3000mAh, 20A, 3.6V, Grade A Lithium-ion (LG18650HG2)
( https://voltaplex.com/lg-hg2-18650-battery-lg18650hg2 )

Since it has a discharge rate of 20A, and we need 300A, I need to put 15 in parallel (with 3000mAh per cell it will give me 45Ah capacity total)

Since we need 44V (or 48V) I’d go with 13 in Series
That’s 13S15P makes a total of 195 cells.

45A with 48V = 2.16 kW/h

Each cell weighs 48grams, 48g * 195 cells = 9360 grams = 9,36 kilograms (a little over 20lb) plus the caps, bus bars, cables, shrinkwrap and such…

And we need a proper Battery Management System, that is capable of supporting up to 13S and 300A,
this one should work: 300A BMS 2S 16S LiPo Lebensdauer der Batterie Management System TFT LCD Display Smart Lithium lifepo4 Li Ion Zellen chargery BMS16 V 2,0 neue|li-ion charger display|lifepo4 chargercharger lifepo4 - AliExpress

Again, is my thinking correct? Any comments ?

Thanks
Etienne