Well, I want my phone to work as a phone. For it to do that, the batteries must last. Even though I don't have coverage over the whole mountain, it's still part of the "emergency response" equipment in addition to a whistle, etc. Now, I'm certainly packing other stuff like an altimeter and camera, I admit it. But, they are using their OWN batteries, not my phone's batteries. In fact, for the camera, I'm packing two spares. I've never needed to do this for the phone, even though it's on all the time, and even when the battery is showing only two bars out of four sometimes when I leave in the AM. I'll tell ya, if my phone was draining batteries fast, I'd be packing spares for it. (I admit with all that gear, I look pretty bulky when I ski.) As for the phone that the OP is using, it appears it should be lasting longer, but...coming back to the "out of service" issue and battery drainage...where are you skiing and how is the coverage? Looks like you are in Montreal and I'd think the coverage should be good there, but I am not familiar with Canadian carriers. Is your phone always in a service area or could this be your problem? Since you're keeping it in an "inside pocket", I'm hoping you're talking not the inside pocket of a SHELL, but inside your insulated layer?