Then it seems to be simple; what I have to do look like this:
-take the phone out of the box, power off of course, put it to charge for 12 hours (to be a load of 100% safe). After 12 hours turn it on and using the phone until it reaches 15%. Then power it off again, charging 4-5 hours for a 100% and then using it to 15%...and...it's ready! It will be the accurate by the book battery operation ever

If I missed something please notify me right away!
Now I just have to wait for the courier to making the delivery...