Recently I went to my local apple store and had my 5 swapped out for a new one. I was having issues with my antenna and battery. I talked to an Apple genius for quite some time. He mentioned he has great battery life and has LTE in his area. I asked him what his usage is and said 8 hours+ I asked him when I should charge my phone. He mentioned he always ran down his phone until its dead or 3%. Daily. This is something you do once a month? I generally run my down to 20% daily, but I guess running it down further won't hurt? So 5% is the new 20%