In that other link, I don't know if he really did the charge capacity test. I think he plotted a curve using a Samsung spec sheet. I have an LG and Samsung unit from that ebay guy. They are not 4.4AH, but are more like 3.5AH, measured at 120 and 140 watt-hr. The pack have a low voltage cutoff around 33-34 volts though which accounts for less useable power.
I don't ride very fast (12.7 mph) and use less than 8 watt-hr/mile. So 15 miles is easy for me. Someone riding faster might use 15 watt-hr/mile and won't get 10 miles. They're not high capacity. My 10S-3P battery with GA cells has over useable 300 watt-hr, but it cost me $250.
My watt-meter says I can pull 16 amps out of one battery when it's freshly charged. Doing that later will sag it below LVC and the BMS cuts out.
If you put three or more in parallel, it might be a good idea to use diodes in the harness. Also, you will have to charge them separately, and that's 2-3 hours each in sequence.
They're still hover board batteries though. I only charge them outdoors and keep them in a fireproof container when not on the bike. They're nice for a stealth look on my ebike with a small hub motor, with a battery under the seat, but only if they don't burst into flames when riding.
Doing the cost comparison, if you need three or four of these plus a charger, you're at $180. It's not much more to get an ebike battery. I don't mind playing with one or two of these, because I l already have a charger and some nice batteries. I wouldn't want these as my main bike batteries.