If you’re worried about the microscopic amount of radiation this thing puts out, then don’t eat any bananas; the potassium in them has more radiation.

I wonder how they print that serial # in there.

Considerably more difficult than people are claiming, and I'm handy with a screwdriver and open computers daily. First, the supplied Ifixit suction cup is not strong enough to remove the screen. I had to go buy a stronger 3rd party suction cup to get the screen off. Second, as others have mentioned, the replacement battery doesn't fit quite right; the cable is about 1mm too short so the bottom end sticks up a bit. I ignored this and managed to get the two tiny screws (which despite iFixit's claims seem to be exactly the same size) back in. However, upon powering up my formerly flawless screen now just consists of vertical black and white stripes; nothing of use can be seen on the screen. Beware trying to do this fix yourself; it's not child's play at all. Probably worth paying $20 to someone who's done it before.