Fitbit is paying a $12.25 million fine over its Ionic smartwatches, which the company recalled in 2022 after reports that the watches’ lithium-ion batteries overheated and, in some cases, burned customers.

The Consumer Product Safety Commission said Thursday that Fitbit knew a defect in its Ionic smartwatches created an unreasonable risk of serious injury or death, as it had received numerous reports of the devices overheating while being worn and leaving some consumers with second- and third-degree burns.