Just got those 2 batteries. After full charge, i unplugged my phone at 8AM, and after "everyday" normal use, my phone gone dead exactly at 4:37PM. So, almost 9 hours. All was ON on the phone, gps, 4G, etc......idk if it is good or not, but i think it was a little longer than on stock battery. Having those 2 batteries with me, it is more than enough to "survive" whole day....