How Long Does The Iwatch 3 Battery Last. There are a number of factors that contribute to the battery. As a result those considering upgrading to the Watch Series 6 just for an improved battery experience may want to consider whether the other upgrades are worth the additional purchase cost.

A phone call on the other hand will drain a full Apple Watch battery in just three hours. Any important differences are noted in the text. On Power Reserve mode however you can get as much as 72 hours of use.
You can log 100 miles of cycling with Apple Watch 3 before the battery runs out.
The Apple Watch Series 3s battery life is designed to last 18 hours on a full charge but we dont live in a perfect world. Your mileage may vary. This guide shows the procedure on the standard GPS-only version of the watch but the cellularLTE version is similar. It claims about 18 hours based on a decent amount of usage.

