I´m spanish, just in case you want to answer to me in castellano
. I also had the same issue. When i charged it the second time, it reached 100 %, but full charge capacity lowered to 1380 mAh.
In that ocassion the battery was depleted in 11 hours with a high discharging rate. Strange thing is that today when I charged it for the third time discharge rate is low again, something around 120 mAh and the battery´s life expectancy is back again to normal (27 hours or so).
Anyway, the full capacity is still around 1380 mAh. I say around because the number changes by the day.