I have an Samsung Galaxy S2 GT i9100. I have had it for quite a time, but today I noticed something strange:
First my battery had not been charging while I was sleeping: when I woke up I had only about 13% charge left. So I put the phone on the charger while I was making breakfeast.
When I came back to the phone some time later, it had nearly not charged at all: in fact the phone was using more battery then it was charging.
Why is my phone battery's charge dropping when I'm charging? I had this problem the whole day -- it won't charge more then 30%, then suddenly the battery level drops. How can this be solved?