An NYPD cop slapped the city with a lawsuit claiming that he was beaten up by a suspected thief who resisted arrest because his handheld radio had failed, according to the new Manhattan Supreme Court filing.

Rajinder Singh, 32, is suing for an unspecified amount. A spokeswoman for the city’s Law Department said, “We are awaiting a formal copy of the lawsuit.”

He charges the department with failing to test the equipment and provide proper backup during the arrest.

Singh underwent surgery for a tear in his right shoulder.

The Nassau County resident went on disability but is now back on the force.