The Foretrex 201 may be a better bet with its rechargeable Li battery. Several of the guys at my club have these Garmins and the general consensus is that the 201 battery life is better than the 101. Both are quoted at 15 hrs 'normal use'. In fact the 101 has shown itself to be nearer 10 or less while the 201 is more like 13 or 14 or maybe it CAN even do 15!

This is all anecdotal changing room and bar talk of course. BTW I still use an old style Garmin GPS V, but plan on getting a 201 as soon as the impulse takes me....