WASHINGTON - The Obama administration and its opponents are renewing the Supreme Court battle over President Barack Obama's health care law in a case that pits the religious rights of employers against the rights of women to the birth control of their choice. Two years after the entire law survived the justices' review by a single vote, the court is hearing arguments Tuesday in a religion-based challenge from family-owned companies that object to covering certain contraceptives in their health plans as part of the law's preventive care requirement. Health plans must offer a range of services at no extra charge, including all forms of birth control for women that have been approved by federal regulators. Some of the nearly 50 businesses that have sued over covering contraceptives object to paying for all forms of birth control. But the companies involved in the high court case are willing to cover most methods of contraception, as long as they can exclude drugs or devices that the government says may work after an egg has been fertilized. The largest company among them, Hobby Lobby Stores Inc., and the Green family that owns it, say their "religious beliefs prohibit them from providing health coverage for contraceptive drugs and devices that end human life after conception." Oklahoma City-based Hobby Lobby has more than 15,000 full-time employees in more than 600 crafts stores in 41 states. The Greens are evangelical Christians who also own Mardel, a Christian bookstore chain. The other company is Conestoga Wood Specialties Corp. of East Earl, Pa., owned by a Mennonite family and employing 950 people in making wood cabinets. The administration says a victory for the companies would prevent women who work for them from making decisions about birth control based on what's best for their health, not whether they can afford it. The government's supporters point to research showing that nearly one-third of women would change their contraceptive if cost were not an issue; a very effective means of birth control, the intrauterine device, can cost up to $1,000.