Answer by A Quora admin:
Just came across this on Quora:
Set your smartphone to Airplane Mode before you charge it. The battery will recharge twice as fast! It'll just take a shower and a coffee to be fully loaded!
I just tested it on my iPhone, but it should work with all the phones with 'Airplane Mode' I guess.
It's quite simple actually. Your phone charges much much faster (for obvious reasons) if you switch it off. But considering no one likes to go through that pain of switching on and off your mobiles these days, Airplane Mode becomes your saviour if you're running short on time!