Charging at only 800-1000 instead of 1800

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http://forum.xda-developers.com – Hi, My Note 2 charging has become drastically slow in the recent times. Initially, when i checked the charging current using the GCC app (galaxy charging current), it showed me 1800 and now it never goes beyond 1000 and most of the times, it's between 800-900. I have tried doing a factory reset and the problem still occurs. Any clue on how to increase the charging capacity? The reason I want the phone to charge at its max capacity is because I travel a lot and I do not get a lot of time to charge my phone and with its current state, I barely get 10 percent charge in 15-20 mins (HowTos)