I have an Ipad 3 but I am having trouble with my battery life. I charged it overnight last night so when I left home at 8:00 this morning I had 100% battery life. I went to a training and I typed notes occasionally at the training. It is now 6:00 and I have 30% battery left. I work with people that say they use theirs all day and it never drains completely. In fact, I was told by one person they can go for days but yet they use it for everything. What could I be doing wrong?