General Facing strange but minor problem with Battery

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http://androidforums.com – I'm facing a strange but minor problem with my phone's battery. As soon as I plug out the charger after the battery has been fully charged, the battery charge instantly drops by 1-2%. It didn't happen earlier. Also, I'm noticing that the display is consuming 50-60% of battery these days which was 40-50% earlier when I had recently upgraded to 2.3.6(via Odin). Could someone here help me out regarding this? p.s. I use "Battery Widget" to see my battery status. (General)