After consumer complaints of overheating batteries, the company did not immediately report the defect with its Ionic smartwatches, according to a settlement with the U.S. government.

Fitbit failed to report overheating incidents involving its Ionic watches in which customers suffered serious burns, safety regulator said.

Fitbit will pay $12.25 million after reaching a settlement with the Consumer Product Safety Commission for not reporting a known defect in a now-recalled product.

Fitbit has been fine $12.25 million as part of a settlement with a long-standing case with the Consumer Product Safety Commission regarding the Fitbit Ionic.