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This is neat....
- Thread starter a-m-k
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It's like eating ice cream with a bigger spoon.
I bought several 12 watt iPad chargers. It's all I use now on our phones. From 0% to about 75% the charge rate is one percent per minute. Is great to plug in when you want a quick pickup. Fifteen minutes will get you 15% 
I've tried this on my 6S plus and it took 2 hours and 42 minutes for a complete charge. I doubt it takes 5.5 hours using the charger that's included.
Geico commercial....15 minutes gets you 15%Huh?
It should be noted that only newer iPhone's will charge faster with a higher wattage charger.
I have been using an iPad charger to charge all my devices, including my iPhone for years.
Just wait until Apple comes out with quick charging. Charging your phone from 0-100 in under an hour is pretty sweet.
All my friends say this is bad for the battery and I disagree, I tell them the iPhone 6 and newer are built to handle that much so it's fine, whereas iPhone 5S and below simply wouldn't accept any more than 5 watts. They simply say "scientifically speaking, ramming more power into a cell is just going to damage it" and I just go wtf and quit arguing. Who's right?
Over a long period of time it probably would be bad. But for the 1 to 4 years that people typically hold on to their iPhones, the impact will likely be minimal, and easily offset by the 'win' of faster charging. This is my guess as to how Apple sees this.
The charge rate using the iPad power adapter is well within the safe charging rate for the iPhone's LI Ion battery. This has been discussed in numerous other threads. The built in charger circuits in the phone keep the charge rate safe and draws only what it needs based on battery charge level. Larger wattage power adapter offers additional amps, it does not push them in. The iPhone regulates what it takes. Will not reduce battery lifetime. If you want to maximize battery lifetime, keep charge between 40% and 80%. This will help battery last for 8 to 10 years. But why, the phone will be on it's fourth owner so what do you care.