Why has the battery on my a3 dumped

[AC Question]

I have had my phone for 3 days, when I went to bed at 11pm it had 40% battery left. When I got up at 6am I had no battery left and it had turned off.
I don't have any thing like wifi turned on and I have no apps on it.

 

[belodion]

What did your battery usage stats indicate as the main users of charge?