John is having an issue with his first-generation Apple Watch, where during a hot day during the summer, the whole face of the Apple Watch was becoming detached from the device. Leo says that's because of the lithium-ion battery within the watch, due to the heat. The battery can swell up due to age, defect, or heat, and eventually explode. Leo says that John might be able to take it into the Apple Store and get it replaced for free. But since it's a first-generation Apple Watch, Leo is not sure what Apple will do. But if John is friendly about it, Apple may replace it regardless.