What is the best way to store a battery when it will be some time without use? Fully charged or fully discharged?

[#1]

I have a mini xperia with the overheating problem as I can not use until Sony update the software, so I decided to store my phone until the day finally comes to the update (according to my calculations, around June 2014, on the basis of Sony has super speed in the update)

Google translator

[#2]

It should be charged at 25-40% and removed from the phone.   Place it in a plastic bag or airtight container to prevent it being exposed to moisture and store it somewhere cool.   Some people say to store it in the fridge but it's generally accepted that about 15C is all you need.

A battery will discharge even when stored so it might be a good idea to check the charge every couple of months as the battery can be damaged if it completely discharges and is then left in storage.

[#3]

Ok ... Thanks for your answer. But where I live the average annual temperature is about 30 degrees celsius (it is for that reason that I can only use my Xperia mini for 5 minutes) what would be the optimum temperature to store the battery?15 degrees celsius?

Google translator

[Uliwooly]

the hotter the battery gets the less juice you will get out of it, or the faster it will drain