Whit the MagicDust widget you can double the battery life of your MIPS device for all activities.
Download it here for free: https://apps.garmin.com/de-DE/apps/ffcee43d-ef4f-4175-a55a-c46b6cc2918d
Here you can find a short getting started: https://magicdustwatchface.wordpress.com/widget-getting-started/
Hints for the operation can be found here: magicdustwatchface.wordpress.com/.../
Please try it out and let me know how good the battery booster works for you.
Have fun with this free app,
The Magician