Can the original Gameboy be played with an AC/DC adapter?

I recently found a discussion on Twitter where a user claims to have bought a power adapter for her Gameboy, and many people criticizing her because the Gameboy used AA batteries.
Now, I'm too young to have used the console (my first console was a Gameboy Advance), so I have this question.
Is it possible to use a Gameboy with an AC/DC adapter? If so, was the adapter used to charge batteries or only to power the console itself?
Best Answer
Yes, the Gameboy has a DC jack:
However, it is one with a built-in switch to switch between the batteries and the DC input. This switch isn't perfect and the Gameboy has very small (nonexistent?) supply buffer caps, so plugging/unplugging the adapter during a game usually crashes or resets the game.
It is not used to recharge the batteries. (The Gameboy can be powered from non-rechargeable batteries.)
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Answer 2
I can confirm that I had a Gameboy (Pocket, but my brother had a normal one) and an adaptor for it.
I think you were technically meant to use it on a Gameboy without any batteries in, but we frequently used it with batteries and it did charge them to an extent, though I couldn't recommend you did so.
I believe it could also be used with proper rechargeable batteries to recharge them too.
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