Battery falling off a cliff (Bangle.js 2)

The always on display and GPS via phone shouldn't use any noticeable power, but:

• Definitely ensure 'wake on twist' is off
  
• If you can make do with HRM every 10 minutes that'll help too
  
• Be careful about your choice of clock face. If it shows seconds it'll kill your battery. Some faces are better than others too (although it's very hard for us to test/quantify each one I'm afraid)