Up to 18 hours
- All-day battery life is based on 18 hours with the following use: 90 time checks, 90 notifications, 45 minutes of app use, and a 30-minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours.
- Apple Watch Series 3 (GPS) usage includes connection to iPhone via Bluetooth during the entire 18-hour test.
- Apple Watch Series 3 (GPS + Cellular) usage includes a total of 4 hours of LTE connection and 14 hours of connection to iPhone via Bluetooth over the course of 18 hours.
- Testing conducted by Apple in August 2017 using preproduction Apple Watch Series 3 (GPS) and Apple Watch Series 3 (GPS + Cellular), each paired with an iPhone; all devices tested with prerelease software.
Let's focus on #3. Is this a 4 LTE + 14 Bluetooth or 4 LTE
OR 14 Bluetooth? This would seem to be in contradiction to the workout hours. They state 4 hours of LTE with GPS or 5 hours of LTE without GPS. (Both would be in conduction with running the heart rate monitor)
LTE (Connection) + GPS + Heart Rate = 4 hr
LTE (Connection) + Heart Rate = 5 hr
LTE (talking) = 1 hr
I think you may be correct. they way you put it.... You can have the watch on for an 18 hour day assuming you have an LTE connection for no more than 4 hours. and in that 18 hours you can perform 90 time checks, receive 90 notifications, 45 minutes of app use, and a 30-minute workout with music playback from Apple Watch via Bluetooth...
but one thing is clear... Making a call basically whiles out your battery.