[chaitanya nagavarapu]

Hey i am currently using lumia 720 which is awesome in its performance.. finally witth this phone i have love to this one ,..once i charged in the 110v power in train from then the phone charging rate has fallen from 33 % to 12 % , i was terribly shocked to see this and later one of my friend is using lumia 520 and he too faced the same issue so i called him and inquired ,he suggested to drain the battery fully and charge it again so like doing that i have somehow reached to a charging rate of 23% now.. i am not at all happy with the charging rate ..!
anybody could help me ??