I never took the battery out while cleaning, I just dont spray too much water and not where it doesnt need to be, when the battery is out the water can get into the connections and such like that since the battery isnt there to block that
As someone who rides both those and mountain bikes, that's not what we care about, it's the fact that these weigh a lot more then a mtb and destroy our trails, at the very least, be respectful and do what you can to repair the trails so someone on a mtb doesn't break a bone because of people digging deeper and deeper ruts