My iphone 4s went dead, recovered and dies twice or more times a day after that

Question

My Iphone 4s was found dead during the day. I did a hard reset and manage to open it, asked me to restore it again and succesfully worked for less than a day. This is happening for the last 5 days. Today it went dead 5 times. I bought this device in the USA and now i am in Greece where Apple does not provide a direct service, only via the local carriers who service only the ones they sale. This is not a propper commercial attitude.
So fellows please help.  THANKS

Answer 1

What made the trick for me was to drain the phone completely - until it dies. (It took quite a while to go from 3% to 0...). Then, charge it overnight.
Previous days I would start charging it with the battery at 10-15%, on red. Also for the last week I've been trying disabling functions, with the hope of finding what was the "offending" piece but without much success. Still was loosing about 10% per hour, just by using it to check emails, maps, and sometimes a call.
Today is almost two hours since I left home, with everything turned on again, used mail, maps with traffic during the ride to work, some browsing - using it "normally" - and the battery is still at 95%.
That looks more like normal to me.!!
Might try to drain it to 0% again as many other suggested, but if it is a battery charger "calibration", it shouldn't be necesary to do it more than once.