I read this shortish young adult/kids book probably in the early 2000s, but I believe it was probably a couple of decades older. The cover was /very/ 80s, I recall, with realistic (but drawn, not photographed) people doing some sort of action-ish scene. I think the surrounding space was navy blue.
The plot concerned a man who created a young teenage robot son and sent him to school (probably early high school?). No one there knew he was a robot. The son looked human, but was very bad at interacting with his classmates because he didn't understand social cues at all. He always spoke and interpreted others extremely literally.
A couple of details I remember:
1) The boy had to charge himself through ports that were hidden under his skin. He was also extremely strong and fast.
2) There was a scene where he got in trouble with a teacher and was trying to recount an incident, but accidently recounted it while perfectly mimicing the voices of the people he'd been with, so it made the teacher angry.
3) I'm pretty sure at least one girl had a crush on him, and he was very confused about that. She used some euphemisms that went over his head.
4) His robot body was fallible--I don't remember specifics, but I think it might be that he was vulnerable to water or electrical surges or things of that nature.
This book may have been the first of a series, but if it was I never read the others. I think the title was like 'Main Title: Subtitle.'