It’s Time to Embrace the ‘Bad Mug’ — Even If That Means Never Using It Despite its lame typography or weird texture, the dumbest cup in your cupboard serves an invaluable purpose ...

The mug is available in two sizes that determine how long the battery lasts: The 10-ounce mug can last up to 1.5 hours, and the 14-ounce can last up to 80 minutes, according to the brand.