I've seen tons of posts here about what is the difference between the 5-watt, 10-watt, and 12-watt chargers for the iPhone and I've done an experiment myself with two iPhone 5s. Many claim that the 10 or 12-watt charger gets their phones charged much quicker than the standard 5-watt charger My conclusion - it's all in your head Over this weekend, I took two iPhone 5's and and plugged one into a 12W charger and another into a 5W charger. Both were at 60% battery level. Both iPhones reached 90% at almost exactly the same time!! Oddly, the 5W charger reached 90% about one minute before the 12W charger did. I performed the experiment one more time using a 5W and a 10W charger. Exact same result. So, at the end of the day, this idea that the iPad charger will charge your iPhone quicker is all in your head. And if you can prove that the iPad charger will charge your iPhone quicker, I would also want you to make sure that your iPhone charger isn't a fake charger or a charger not made by Apple. I hope this answers a lot of debates that take place in this forum in regards to charging times.