I recently cleaned out my closet and found a Nintendo DS, 3DS, and 3DS XL. I hadn't touched them in years. To my surprise, all of them immediately turned on. I guess I'm so used to devices bleeding battery even when "off" that I figured it would be the case here, but not at all. I also found a Gameboy Advance SP with no batteries in it that booted immediately when I put fresh ones in. I think it says a lot that I was surprised by that.

I wish more companies built hardware the way Nintendo does.