Is this cart real?

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So I purchased this 'CIB' Pokemon Yellow (Minus the clear protective box) upon playing it i found there was a save so i opened it up to check it was real. upon opening it up I realised the battery has been replaced which is a good sign of why it saves. but I just want to make sure it's real as the housing looks really clean and it may just be a really well looked after cart as it's original from the previous owners childhood apparently.
sorry for such a bland first post here but cheers Reddit.
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https://preview.redd.it/7n2odmg7zj351.jpg?width=2448&format=pjpg&auto=webp&1230e8ab

submitted by /u/MotDatrix
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