I get 24hr from the 800 and a Powermonkey. I have an etrex Hcx Vista that uses AA but it's clunky and as I said above I don't like following a line on the screen. Prefer TBT.
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It's actually called 'Garmin External Power Pack' (it's made by Powermonkey)
https://www.google.co.uk/search?q=garmin+external+power&oq=garmin+external+power&aqs=chrome..69i57.183j0j7&sourceid=chrome&es_sm=0&ie=UTF-8#q=garmin+external+power&tbm=shop
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I get 24hr from the 800 and a Powermonkey. I have an etrex Hcx Vista that uses AA but it's clunky and as I said above I don't like following a line on the screen. Prefer TBT.