Default Safe Mode?

While attempting to get a warranty replacement for defective battery (drains to ~50% and then poweres off) I had a tech ask me if I had tried running it in safe mode. I was wondering if he was just trying to get me off the phone. He claimed I could long press the shutdown message and would get an option for "safe mode". I think he's nuts but couldn't verify as I was running CM 11 at the time. Going to try later.