How to fix slow charging Asus Fonepad?

I had my Fonepad last January 2014 and its just on October it started to slow down in charging, just wanna ask how to fix this problem?

I think that's one of the cons of the Asus Fonepad. Other users experience this too. I suggest turning off Wi-Fi, Data, Bluetooth, GPS, and minimize the brightness to increase charging speeds. Charging while it is off is the best.

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