Samsung Galaxy SII Charging Issue

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http://androidforums.com – I own my phone for 1 year and seems like the battery having a problem. I charge it every night and it is 100% charged every morning. Recently I can see the percentage drop very quick even I dont use it much. I then purchased a new battery via internet eBay. It has the same issue. Also the phone is getting worse since I put the new battery. I have been trying with both new and old battery. When it said Battery is low, I start to charge it, some time at work with a usb, i noticed that when it started it has 14% of battery, after charging for a while, it dropped to 8 and then 4% without any usag (General)