While I wouldn't want one, I do see a battery powered bicycle as being a little different from a battery powered moped, scooter, or car. Those are supposed to have internal combustion engines, as far as I am concerned. On a bicycle the rider is the engine.
I now have NINE bikes (5 motorcycles, 2 scooters, and 2 mopeds) I am divorced, and my kids are in their mid 30s, so I live alone. I converted my living room into a bike shop/storage place. 5 of those bikes are in there. They don't all get ridden that often. I have a couple that haven't been ridden in over 2 years. But they do get started up, warmed up, and moved around a little at least every 2-3 weeks. Several of them have TruFuel in them. Unlike ethanol gas, it has a lifespan of 2 years, so I don't have to worry about it going bad and doing serious damage to the fuel system. I also have 3 cars and a truck. Only one is used on a daily basis. But the other 3 get warmed up and driven at least 5 miles every couple of weeks. All the bikes with batteries have battery tenders on them. I retired last year, so I have more time to spend with my vehicles now. Internal combustion powered vehicles have always been my main and only real hobby.