Fitbit has issued a recall for its Ionic series of smartwatches due to a possible burn hazard.

According to information listed by the Consumer Product Safety Commission, the lithium-ion battery can overheat and cause burns. In the U.S., there have been 78 reports of burns related to the issue. Of those, two were third-degree burns and four were second-degree burns.

Ionic FB503CPBU - Slate Blue/Burnt Orange

Ionic FB503GYBK - Charcoal/Smoke Gray

Ionic FB503WTGY - Blue Gray/Silver Gray

Ionic FB503WTNV - Adidas edition, Ink Blue & Ice Gray/Silver Gray

Fitbit toll-free at 888-925-1764, available 24 hours a day, 7 days a week or online at help.fitbit.com/ionic or www.fitbit.com and click on “Product Help” at the bottom of the page for more information or fitbitionic.expertinquiry.com.

Anyone with a watch is urged to stop using it immediately. They can be returned to Fitbit for a refund and a possible 40% discount on some Fitbit products.