Hi,
I am from Venezuela and have the cellphone service in Movistar.
The standard battery life was only 12 hours!!!!!!!!! I bought last december the Seido 3200mAh and the case for extended battery and it works very fine :P .
The new battery life is around 36 or 48 hours, that depend of the use.
By the way sorry for my english..... I speak spanish in Venezuela ...
Regards
edgar2049