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My 800 would max out at 13h with minimal nav and I never connect anything like Wifi or BT.
810 has the same battery I believe so you're probably looking at 8-10hr mark for what you're doing but it all depends on temp, age of battery, etc.I normally use my 800 for time trials (with a Garmin battery pack for 24hrs).
hippy
@NotThamesWater
How long could I expect a garmin 810 battery to last if I am using it for navigation and have it connected to a phone via Bluetooth?
@hippy - what do you use for your 24 jaunts?