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My 800 will get about 10 hours in map mode, and 12 on normal info screen. Don't think any of the news ones come close to that. I charged it twice a day on the divide, from the dynamo usually, or the cache battery if it was already dark and I was using the light.
It also depends what the route is like. The divide is SO vast, and with so few turns, that mostly I didn't use the map, but I had split to route into 200 mile tcx routes using ridewithgps and added cues to the turns, the 800 can then show you the next cue and how far it is. Was really easy, and also added a cue for the city limits of each town. So I could go to the cue screen and see that Pie Town was 76 miles away etc etc. If you're riding a more technical route or it's in built up areas, you definitely need the map view more.
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turnpedal
user67649
I've been deliberating what to go for. I see loads of people still using the etrex, but the fact you can't charge them from a dynamo if you don't want to use AA's is a bit off putting. But then I keep reading in reviews of newer Garmins that the battery life is only around 5-6 hours if you're using navigation mode, which is the main function I want. So I'm guessing it would mean having them on near constant charge?