Earlier this month, a San Francisco judge ruled the surveillance video in Chahal's home was unlawfully seized by police, despite prosecutors' claims that they worried the video would have been erased.
After pleading guilty to the misdemeanors, Chahal was sentenced to three years' probation and ordered to take domestic-violence classes without serving any jail time.
Chahal wrote in a blog post Sunday that he lost his temper but accepted full responsibility. He apologized in the blog but added, "I didn't hit her 117 times."
Chahal wrote Monday that he intended to be exonerated of the felonies that he thought likely would go to trial. "But, I ended up taking one for the team and accepted the DA's proposal and settling this case," Chahal said.
Before leading RadiumOne, Chahal founded and sold two Internet companies for nearly $300 million.
His status as a wealthy entrepreneur landed him an appearance on "The Oprah Winfrey Show," a role on Fox TV's "Secret Millionaire" series, and a mention as one of America's most eligible bachelors on the entertainment television program "Extra."
RadiumOne has said Chief Operating Officer Bill Lonergan will take over as CEO.