Battery FULLY discharged overnight

Good Morning everyone! yesterday I fully charged my Ipad Mini Retina 16 GB IOS 7.1.2 , I used it for some minutes and I put in in standby mode for the night. This morning I woke up and the battery was FULLY discharged, I had to recconnect my ipad to the charger and now it seems that it is charging properly.
What is happened? do I have to get worried? because my Ipad is still under the international warranty, is it better if I check with an Apple Store? Somebody else got the same problem? how did you solve it?
thanks for your answers and feedbacks,
Stefano

Push email has always used a lot of battery as it trys to keep an IP connection open to the email server. Using Chattermail (on a Palm Treo) the Push settings had several optimizations that could be used to lessen the update frequency, not try to push when the signal was weak, etc. Even with those settings enabled, I had to recharge that (extended) battery every 36 hours or so.

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