Ember then maintains your chosen temperature for up to 1.5 hours with the Ember Mug 2, 10 oz and up to 80 minutes with the Ember Mug 2, 14 oz - so your hot beverage stays perfect. Our smart mug allows you to set an exact drinking temperature, so your coffee is never too hot, or too cold.
I had an Ember mug for about three years using it practically every day. I assume the battery "wore out" as it no longer charged even with a new charging saucer. I love it!