iPod nano 3rd gen charging fuse?

I have two ipod nano 3rd gens, I only need to fix one but there are multiple problems, the first one has water damage and will not hold a charge even after a successful battery replacement, I think the charging fuse is corroded, second one has damage to the motherboard but I know has and okay charging fuse. I want to swap out the fuses, I have zero idea where the fuses are.