It does not make a difference if it is dead or certainly. It should take max 3-6 hours to charge to full power even if you still have battery left behind. There is a big difference in how long it will end. There is a standby mode when you are not using it which most phones last up to several days 3

Water is capacity the most important items in your pack, and definitely the heaviest. Have to have it to sustain energy. You need it to avoid body aches, headaches, and having so uncomfortable that you don't enjoy your hiking experience. For factors like this post, I have eliminated hybrids.