Fitbit recalls Ionic smartwatch after 78 reports of burns

Yesterday, a cargo ship with 4,000 cars sank into the ocean reportedly due to fires resulting from lithium-ion batteries in electric vehicles. Today, Fitbit recalls millions of watches due to lithium-ion batteries causing burns.

I'm starting to wonder about the safety of lithium-ion batteries. Does anyone have any insights on whether these are isolated incidents or something to be concerned about when buying products with lithium-ion batteries?