I just discovered the tags that are applied to other posts that I have seen. And I just found this post https://community.onewheel.com/topic/8177/concave-footpads which tells me a lot of the kind of info I was looking for.
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RE: Favorite foot pad upgrade?
Fan/hissing sound from board at very low battery
Hello! I have on occasion unintentionally ridden the battery on my Pint down to 4% charge and even less. And a few of those times I have noticed when I go to shut the board off, that it sounds like a fan is running inside the board. The sound is almost hissing-like. I have an audio recording and can upload an mp3 if there is a way to do that here. Anyway, the fan/hissing sound seems to continue until I shut the board off. When I turn the board back on, even if it is just seconds later, the sound does not resume (thankfully). Does anyone know what is causing the sound?