It took a few reloads to the battery reaches its maximum potential load resistance over time. Take care when the charge level is between 15 and 20%, not lower. My S2 now takes one day and a half with a little mails consultation (5-6 times), some surfing (1 h in all). But I cut the data connection, wifi, bluetooth and GPS when I do not need. For the S2 is well known, is an energy abyss.