New Garmin Fenix 6 pro battery drained 33% in 12 hours, no GPS nothing other than this watch face (photo) and phone connection that showed ~50/60 notifications during the day. I have
361-00086-12 Battery For Garmin Fenix 6s,6s,sapphire Fenix 6s Pro Watch Li Polymer Rechargeable Accumulator Replacement 3.8v - Digital Batteries - AliExpress
For Garmin Fenix 6x Pro 6x Pro Solar Gps Watch Back Cover Case With Rechargeable Li-ion Battery Replacement Part - Tablet Lcds & Panels - AliExpress