Pretty much everyone knows an iPad charger will charge an iPhone faster than the standard 5W one that comes with iPhones, but I haven't seen any quantifiable evidence that shows how much faster it charges. So, I decided to test the standard 5W charger, a 10W charger from an iPad Air 2, and a 12W charger from an iPad Pro to see how significant the difference is. The testing dummy is a TSMC iPhone 6s Plus with ~12 charge cycles. Even though the phone is fairly new, it's been loaded with a backup that's been in use for about 11 months. For each test, the display will be powered ON, albeit with auto lock disabled, airplane mode enabled, auto brightness disabled, and the brightness set to the lowest level. As soon as the phone hit 1% AND 0 mAh, I ran the custom app I built and plugged the phone in. Without further ado, here are the results! It looks like 10W and 12W charger are just about the same, accounting for margin of error. However, either iPad charger is about a third faster than the standard iPhone one! Hopefully this was informative! For those interested, you can find the raw data here.