[justinator]

One of the benefits of these old eTrex models is that they run on AA's, so they're used for things like long distance cycling (across countries).

I don't know if there are top tier models that run on replaceable batteries you can get at any gas station.

[lostlogin]

They have solar ones, but judging by reviews, they get about 10 minutes extra battery life per hour in the sun.