What AW activity uses a lot of battery power?

Activity tracking uses the most for me. Since the heart rate sensor is on the whole session.
Navigation is second place. It uses the screen and vibration alot. So a long walk with directions will deplete the battery.

 

The GPS is the worst power thief in the AW2,in earlier versions,it's the Bluetooth when you use navigation or GPS enabled activity functions.

 

You have a Series 2 and didn't have your iPhone? Next time carry your iPhone and the Watch will use the iPhone's GPS. Also the biggest battery hog would likely be using a Series 2's Workout Outdoor app, without your iPhone. That is continuous GPS and HR monitoring.

 

Only seen that battery save mode message a few times,always when using navigation or GPS tracking. For my normal daily use,I have no battery problems at all. I got the AW2,use the standard activity tracker,and the music player remote a lot,and sometimes I use it for turn - by - turn navigation too. Other battery consumers for me is news feeds,email and messages.

 

GPS tracking and streaming music to your earphones at the same time is a battery hog; saying that, I've never had the low battery message yet.

In general use I'm very pleased with the battery on the AW2 - notifications don't seem to use up much power.

 

may not be considered an activity but the screen is likely one of the major battery users.

 

What % was your battery at before you starting with GPS for the 30 minutes? Might be possible to narrow down why it dropped so quickly.