The lithium battery in my Palm Vx lasts all week at Scout summer camp. I don't use it much while camping, to be honest. I have all of the Boy Scout rank and merit badge requirements, a HandDbase database I track progress on the merit badges I run, Planetarium (real cool app that doubles as a compass), Weather Radio channels & frequencies for WI & IL, and misc. info. (recipes, songs, skits, survival tips). I also have a travel kit that includes a power adaptor that I can use to recharge the battery. It requires AC power, which is usually available, or I can plug the adpator into a power invertor I carry in my car. But I haven't had to go to that extreem yet.<br><br>Summer camp is not wilderness survival by any stretch of the imagination. But if you have your PDA in a true survival situation, and it survives whatever catastrophy that opit you in that situation, it can be an excellent addition to your survivial gear.<br><br>It may not last much more than a weeki. But by then you should have used it to plan and prepare for your survival efforts ahead. Remember the STOP acronym? A PDA can help you through that process. Gleen from it the information that you will most likely need for your situation. Perhaps you would even transfer some key info to paper.<br><br>By the end of the first few days, you should be in a routine based upon your surroundings, environment and situation. You will not likely need to referrence the PDA again, except if you run into brain freeze. <br><br>After a week or so, after the batteries have worn down, you're into a long term survival mode and a PDA is not going to save you. At this point, you must have retained knowledge and experience on survival to get you through.<br><br>As an aside, if you do find yourself in a survival situation and you do have your Palm, remember to disable uneccessary applications that may consume power. I beleive some of the "hacks" I have installed may eat up power. Like the Afterburner hack I have that cranks up the system processor speed to boost performance. Ther may even be utilities available to conserve battery life. I'll take a quick look around the web latter today.