Definitely congratulations on training your scouts. I would hope my scouts could perform as admirably, but I have my doubts.

Last summer, our troop did a quick 2 night, 15 miler. It was a through hike with a different drop off and pick up. The plan was for me to call the ride when we were at a certain peak (one that I had gotten reception from before....and it is line of sight from the nearest town). When we finally got to the top, my phone battery was dead, and so were all the other leaders' cell phones. Luckily one of the older scouts had a cell phone with battery power. Ever since then, I carry the battery outside of the phone, if I expect to use it.