Help with bent broken iPhone 6s?

So my friend gave me his old phone that he purposely broke smashing it against the floor a few times for the fun of it. He gave me the 6s knowing I like fixing iPhones, however, I don't know if I should invest in fixing this. As I was unbending the bent iPhone, there were a few very hard to hear crackles and I was worried I messed up the motherboard. I will probably go to the shop in a few days and plug in a battery and screen to see if the motherboard is damaged at all. Hopefully not. When I got the phone it vibrated and made the charging noise when plugged in. I messed up the battery and it stopped. Do you guys think the motherboard or anything else is internally broken on the insides?

Nnaybe your friend should pay to get it fixed

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