About 50 people gathered in Charlotte an hour before the president was to arrive, carrying signs and waving American flags.
High Point businessman Larry Davidson says the health care reform package will ruin what he called "the best health care system in the world."
Charlotte Dr. James McGukin says Obama will "destroy the country."
The President toured the Celgard plant to tout green energy jobs. The company makes rechargeable lithium batteries used in notebook computers, digital cameras and other devices.
Earlier this year, the company received a $49 million grant to help develop batteries for electric vehicles.
Tea Party activists gathered near the plant to show Obama they are opposed to his policies, including the health care overhaul which passed after more than a year of contentious debate.