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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?

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Have you tried to completely shut down the phone, removing the battery for at least 30s, put it back into the phone, and charge it while the phone is still switched off? Might be it's just the display of the charge level (i.e. the "reporting process") which is "confused". –  Izzy Mar 10 '13 at 22:42
    
Maybe you have a problem with the cable of the charger. –  false Mar 11 '13 at 1:02
    
i think it was the cable... i used a sony ericson greenheart charger last night and my phone charged perfectly normal. and my battery has been nice to me the whole day so far :D –  Christofer Viggen Mar 11 '13 at 12:55
    
On S3, I use HTC cables after a couple of Samsung cables that all started to make problems after a few days. –  false Mar 11 '13 at 13:00
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3 Answers

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.

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The cable does make a huge difference, so I'm glad that I read your new cable made it last for a day. In addition, once a week you want to do a full charge cycle. Completely waste the battery, [to the point where you can't boot] and charge it for 8 hours straight, off.

I find that shorter, thicker cables make the battery of the device last longer.

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This mostly starts when you upgrade your firmware. I believe the Jelly Bean upgrade is a big drain on the phone resources.

My way out? Throttle down the CPU speed (antutu or CPU-Z can do the job for you)

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