Bynum has a quieter night

Andrew Bynum’s cellphone was ringing at an unstoppable pace.

Or so you would think.

After a notable debut as a starter Tuesday night at Staples Center, Bynum left his phone charger at home during the Lakers’ overnight trip to Golden State.

“My phone died,” Bynum said Wednesday. “I haven’t been in contact with anyone for a day.”

Ah, the innocence of youth.

Bynum, who turned 19 last week, followed up his 18-point, nine-rebound effort against Phoenix with a five-point, four-rebound game Wednesday against Golden State.

He picked up two fouls in the first 6:21 and wasn’t much of a factor.

To his credit, he sounded more like a veteran than a teenager, dismissing his opening-night success before taking the floor for his second career start.

“It doesn’t mean anything if we come out here and lose tonight,” he said.

Bynum worked on his physique, particularly his lower body, during the off-season, a difference-maker in the eyes of assistant coach Kurt Rambis.

“If you look at a videotape of him last year and look at him this year, his body’s been redefined,” Rambis said. “He’s a lot stronger now than he was last year. His conditioning is a lot better.

“I think you’re seeing glimpses of a real good find for the Lakers. I think he’s going to be a good player for us for many years at both ends of the court.”

At the same time, Rambis, a power forward who logged 14 seasons in the NBA, cautioned against over-hyping the 10th pick in the 2005 draft.

“You’ve got to say all this optimistically and albeit be somewhat guarded because nobody’s seen him around the league,” Rambis said. “Rookies, they come in and they might light up the league for a little bit, and then the league finds out how to defend him, what his strengths and weaknesses are, and then they can start playing him, figure out what they can do to limit his effectiveness. He’s going to have to make adjustments as well. He’s got a long haul in front of him.”

*

Kobe Bryant remained back in Los Angeles, going through an individual workout, followed by treatment and therapy in an effort to play Friday against Seattle.

He is considered day-to-day, although Lakers Coach Phil Jackson acknowledged a degree of disquiet regarding his condition.

Bryant was supposed to be healthy eight to 12 weeks after undergoing mid-July arthroscopic surgery on his right knee. Saturday marks the beginning of week 17.

“I’m concerned any time a player doesn’t feel he has the freedom to move physically the way he wants to, particularly a guy like this who’s used to playing 40, 41 minutes a game and being a dominant figure in the ballgame,” Jackson said. “That’s a big concern.

“I’m sure the fans will be disappointed, but ... we’ve watched him try to work his way through this. We understand full well what he’s going through.”

mike.bresnahan@latimes.com