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carson
Garmin all the way, used in cycle computer mode up the climbs and up high on the mountain where the route is obvious, and only in actual navigation through towns. I was able to stretch my edge touring battery to 13/14h this way. I had a 22000mA battery pack with me that lasted the whole trip (charging phone, gopro and garmin - despite weighing 400g)
The route is simple enough to do without Garmin though, you could have paper maps if you prefer and use your phone as a backup if needed
If you plan to stop at bars/restaurants/cafe or hotels/campsites you can recharge there too