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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).

  • Tell me more about this Garmin battery pack - how does it differ from a standard li-ion battery?

    13hr might not give me enough time...

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