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Yeah absolutely fair enough, it sounds good and in line with my vaaalues of 'there's usually a cheaper, better, more eco/whatever option' !
I've actually got a second hand Edge (800...?) whose battery is very much on the way out, so considering options/whether battery replacement for the Edge is really feasible
si_mon628-
You can get the parts off ebay for pennies, it's worth it. The only reason I ever stopped using my garmin 800 is it was a pain in the hole having to plug it in to get activity files off it to upload.
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My Edge 800, used well since early 2015, has been worse and worse on batter and even the power button broke (the seal, the button still worked with some gimmicky pushing). After looking on the options I decided to buy Lezyne Mega XL GPS and I am very happy with it. Battery life is wonderful, monochromatic display is enough and easily readable regardless of conditions, finally got some smartphone integration. Maps are OSM based so also fine, just requires phone connection for starting navigation. Also cheap second hand, sold Edge and only had to pay 30GBP extra for perfect condition Lezyne.
Five-Hats
Prz
Long battery life, very tough, very cheap and you can use it on a hike if you want. Little nubbin can be used with gloves easily.
Because the batteries are AA buying a second hand one isn't so much of a gamble, also they're theoretically live longer.
They're designed as navigation more than cycle computers though, so I think some cycle computer whizz bangs like displaying power meter readouts on screen or whatever don't work as well.
Really I would ask yourself what the advantage of a dedicated cycle gps is compared to the etrex rather than the other way round. And if you can't justify the price for the added features, get a second hand etrex.