Common eBike problems and solutions

Hey everyone!

I've been riding my folding eBike (a RadExpand 5, mostly for city commutes and some light trail riding) for about a year now, and I'm curious what common issues other folding eBike owners have run into. I've had a few minor things like a creaky hinge that needed lubrication and a slightly finicky battery connection after a lot of folding/unfolding.

What are some recurring problems you've faced with your folding eBikes, and more importantly, what clever solutions have you found? I'm particularly interested in things related to the folding mechanism or compact design. Let's share some tips!