What do you think about this one? From my iPhone 4S. I think it is very good but I need opinions.
Usage: 9 hours, 32 minutes
Stand by: 22 hours, 3 minutes
EDIT:
I always turn off 3G and WIFI when I go to work because GPRS is enough for Whatsapp, mail and many sites with mobile versions.
I use SBsettings to turn off 3G and WIFI when not needed
Usage: 9 hours, 32 minutes
Stand by: 22 hours, 3 minutes

EDIT:
I always turn off 3G and WIFI when I go to work because GPRS is enough for Whatsapp, mail and many sites with mobile versions.
I use SBsettings to turn off 3G and WIFI when not needed
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