U.S. regulators announced recalls of more than 500,000 "hoverboards" Wednesday. The motorized, self-balancing scooters — not the floating board Marty McFly rode in the "Back to the Future" films — contain lithium ion batteries that can overheat and catch fire or explode, the Consumer Product Safety Commission said.

The agency said it has received at least 99 incident reports about the battery problems to date, including complaints about burn injuries and property damage.

"Consumers should immediately stop using these recalled products and contact the recalling company to return their hoverboard for a full refund, a free repair or a free replacement depending on the model," the agency said.

The recall affects hoverboards from a several manufacturers, but more than half of the recalled units were from Indiana-based Swagway.

Swagway said the recall only affects a previous version of their X1 model hoverboards. Consumers with the defective units can have them upgraded with new battery units designed to protect against overheating or receive a $200 credit toward the purchase of some of the company's newer hoverboard models.

"Consumer safety remains Swagway’s number one priority," the company said in a news release.

Hoverboards were a hot-ticket item last holiday season, but reports of injuries from falls and the battery issues have dampened their popularity. In one harrowing example, a fire started by a hoverboard burned down a Nashville family's home, endangering two children.

Last year, major airlines banned hoverboards from flights because of the fire risks. Several retailers, including Amazon and Overstock (which is among the sellers involved in the recall), have also stopped stocking some models. (Amazon chief executive Jeffrey Bezos owns The Washington Post.)