I just ordered my cells. I went for these cells.
https://www.nkon.nl/lg-inr21700-m50-4850mah-7-3a-clear.html?___SID=U
It is the same price as I would have payed for the Samsung cells, but instead of 22ah, I have now 29,1ah and that gives me a battery of 1047,6wh.
So a nice big battery. I will get a second one, but for now, this is good.
Most people use 2 10ah batteries and with my 17,5ah that I already have, I have a lot more.
Suze is 21 diameter and 70mm long, so they are a bit bigger, but the pack in total will not be that big.
I expect them Wednesday. I ordered them to late, to be shipped today, but I wasn't ad home to do so.
I could have went for a 24ah size, but I had safes tge money for the other cells and that made me decide to go for it. Better to big than yo small.
With a 350w motor, it is good to have a bit bigger.