A tip that has been circulating the web here recently for charging your phone faster is to place the phone in airplane mode. The reason this seems to be a good idea is because your wifi and cellular radios burn battery as they constantly search for signal. Every time your phone grabs notifications it is burning through battery. The idea is that if you prevent your phone from burning this extra battery your phone should charge faster.
Cnet put this idea to the test in a recent video. The outcome is not really what you were probably hoping to see. It turns out that putting your phone in Airplane mode while charging really will increase the speed at which it charges. In their test the phone in airplane mode charged 4 minutes faster. I know that time is money, but in my opinion a few hours of not being able to receive notifications is not worth the 4 extra minutes saved.
via CNET