my samsung galaxy 2 battery is draining to fast! 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?
Had exactly the same, did the same as you asking questions and hearing lots of different answers. My solution new battery, couple of quid on ebay.