eBike technology explained

Hey everyone!

I've been diving deeper into eBike tech lately, especially with my recent project of swapping out the controller on my old hardtail mountain e-bike for something more programmable. It got me thinking about all the different components and how they interact – motors, batteries, controllers, sensors... it's a lot!

What part of eBike technology do you find most fascinating or, conversely, most confusing? Are there any specific advancements in motors or battery chemistry that you're particularly excited about for future DIY builds or upgrades? Let's geek out a bit!