Why Does My Apple Watch Die So Quickly. Depending on your watch you may need to tap Battery or Battery management. Lithium-ion batteries are known to deteriorate over time.

Lithium-ion batteries are known to deteriorate over time. For the most part solving a quickly draining Apple Watch battery is very similar to the steps youd take on your iPhone. Your watch uses on-device machine learning to learn your daily charging routine so that Optimized Battery Charging activates only when your watch predicts it will be connected to a charger for an extended period of time.
When your mail is set to push it means that your iPhone maintains a constant connection to your email server so that the server can instantly push the mail to your iPhone as soon as it arrives.
Make sure you have connected to WiFi. To turn off Power saving mode tap OFF from your watchs Home screen and then tap the checkmark. After investigating various possible fixes we zeroed in on the culprit---Background App Refresh. If your Apple Watchs battery doesnt last as long as that then you should try this quick tip to give it a boost.

