One more note on your new Etrex.

I find that when the GPS is configured to time out the screen (goes blank to save batteries after several seconds), sometimes I accidently leave it on thinking that I have already turned it off. That is a good way to deplete batteries so that you do not have any power when you wanted it.

Also, I don't like having to keep pushing a button to wake up the screen when I am on a bike navigating. So, I have my GPS units configured to keep the screen on. When I am approaching a turn in an urban area where there are lots of places to turn, so I am frequenly glancing at my GPS to see where the turn is, having the screen time out is quite inconvenient, especially if you are in traffic.

Since I run rechargeable batteries, it cost nothing to do a few experiments for battery life. So, I intentionally left my GPS on a few times, to see if leaving the screen on depletes the batteries faster, battery life is still pretty good with screen on all the time with no backlight.

But what kills the batteries is the backlight. With backlight on full, I had less than half the battery life that I would have with backlight off.

Thus, I have it configured to leave the screen on full time, but I am obsessive to make sure that my screen backlight is off unless I really need the backlight. And when my backlight is on, I only use the amount of backlight that I really need.

Generally, I only need backlight when the sun is low (early morning, or close to sunset) or after sundown. And when it is dark out, I can get by with my backlight at a very low setting. Heavy overcast or fog might also need some backlight.

If you have rechargeable batteries, you can start every ride with freshly charged batteries.