do you know somebody who is doing such kind of customized batteries?
There are two different statements on the Trampa Website regarding what fits into the box:
Usable space for batteries: 205x190x74
I highly considered going liion in mine, but for a pack the size it was lookin to be a pretty expensive battery! I opted for the 4 zipped to “try out” the eMTB. I get about 15 miles. And that 4x6200 or 12400mah for each, just ordered the 20.0 from turnigy and am hoping for 25ish miles on a charge
lipos are perfect for small range, high performance.
as soon as you want to go over 20 miles range LiIon are smaller, lighter, easyer to handle and give as well enough performance for most of us.
if you lucky and can do your own pack than they also cheaper than good lipos.