I'm curious why you say that. I looked at the space cell and it looks like a fantastic solution! But, it said it is a 10s3p so wouldn't that offer roughly half the range of the DIY pack in this thread? I can't image the cells in the space cell are too much higher than 3400mAh but I could be wrong. Still trying to learn as much as possible
Yes you are correct, SPACE CELL only has 30 Cells total, they are also much lower capacity at only 2500mah, but what is important is cell performance!
So for comparison sake; S.P.A.C.E Cell is 36Vnom 7.5AH (LG He2) VS
White Pony battery who is 36Vnom 20Ah (pana NCR18650b)
So S.P.A.C.E Cell is much smaller & lighter with just half the amount of cells and on paper has about 62% less capacity, however you need to consider the real world rate of discharge, what is the usable capacity of the cell?, What rate does the cell discharge at when under load?. So you can have a larger capacity battery pack that actually discharges quicker due to voltage sagging... it is all about performance of the cell under load.. these graphs below can show you the performance side-by-side.
Panasonic NCR18650b this is discharge rate of just one cell.
LG HE2 this is discharge rate of just one cell.
These graphs are showing a constant discharge of just 4 amps. So as you increase the rate of discharge, as would occur in a skateboard, the Panasonic would actually discharge much quicker again.
As an example, lets just say your BMS voltage cut off is set to 3.0V per cell, both these cells will last about 33mins. So the extra 900mah of the Panasonic does nothing because you can't use it.
So I suppose what I was trying to say is that I think the S.P.A.C.E Cell is very good value, It is compact, very powerful and good discharge performance, and because I don't want to ride much longer than 1hr it is suitable for me.
So therefore I don't need to pay for more cells to increase the capacity, to have longer range when you won't actually use it. Also more cells = more weight so it can slightly impact performance (acceleration) and is also heavier to carry.... also the S.P.A.C.E Cell has the BMS & On/OFF switch built in, plus it has a digital fuel gauge....