Battery life of Head unit / watch

After checking out the Power Meter battery status announcement recently, I was wondering is there any chance the FIT file contains the head unit battery percentage? I was thinking it would be great if it had the start percentage and end percentage, that way you could work out the percentage used during the activity. This could be used to work out if the battery would last for a long endurance race etc.

I had a look at one of your files on and it doesn’t look like Garmin stores it’s own battery status:

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Ok thanks for checking. Cheers