Does the Iphone stay on while charging?

I have a 4s, just got it and i'm now charging it. I turned it off, plugged it in and it basically turned itself back on because when I hit the home button it turned on. Does it turn on automatically when charged and then off when its finished?! I think thats pretty dumb its just wasting battery being on.lol

Added (1). Aha! If you turn it off WHILE you charge it, it stays off… I just had it off and then plugged it in.

Added (2). Aha! If you turn it off WHILE you charge it, it stays off… I just had it off and then plugged it in.

I believe it does.

Stays on

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