Awful!

I downloaded this app last night, when I began to use it I had 97% battery life. I noticed it was draining it pretty fast, so when I had about 85% left I closed the app (Xed it out and everything) this morning I woke up and my phone was completely dead. Im 100% sure it was this app seeing this was the last app I have installed in sometime.

about iBOOKLIGHT, v4.0