iPhone 6 comes with an Apple 5-watt wall charger that takes quite a bit to charge it. However, the phone supports much faster charging speed and can be in fact charged at more than twice the speed of the stock Apple iPhone 6 charger.
The new iPhone 12 series phones (as well as new iPhone 11/SE 2020 etc.) support USB-C PD fast-charging but do not come with any charger in the box. So if you plan to upgrade in near future you can get a future-proof dual port charger like Aukey Swift Dual Port ( UK type Plug version ). This will fast-charge your iPhone 7 at 2x the speed of Apple charger now and fast-charge your future iPhone 12/12 Pro/12 Mini/11/XR/SE 2020 etc. at 18-watts in future (zero to 60% in 30 mins).
Here are some ways to fast-charge the iPhone 6 at its maximum possible charging speed:
Fast-charge iPhone 6 with 2.4 amp Wall Charger
One of the most convenient ways to fast-charge your iPhone 6 is to replace your stock Apple iPhone 6 charger with a 2.4 amp wall charger. We recommend Anker Powerport 2 Elite 2.4 amp dual USB port charger for because of its great build quality, two-ports, and small, compact clean design. It will charge iPhone 6 from empty to half in about 30 minutes which is almost 20 minutes lesser than the iPhone stock charger. Anker Powerport 2 Elite comes with dual ports, which enable it to charge two devices at once. For example, you can charge your iPhone 6 along with another device such as an iPhone, iPad or a power bank at 2.4 amp fast charging speeds.
2.4 amp fast charging works equally well with all iPads and the Anker Powerport 2 Elite will fast-charge almost all iPads and your iPhone 6 together at their maximum possible speeds. The Anker Powerport 2 Elite will also fast-charge your power bank (portable charger) in half the time taken by the iPhone charger. For example, a 20000mah power bank such as PowerCore 20100 gets charged in about 20 hours or more by the iPhone stock charger and in only about 10 hours by the Anker PowerPort 2 Elite dual port charger.
Charge iPhone 6 Quick with a USB-C PD + USB Wall Charger
All new iPhones 12/11/XR/XS/X/8/8+ support much faster USB-C fast-charging. Also new iPhones no longer come with a charger in the box. If you want a future-proof fast-charging charger for your iPhone 6, then a dual USB-C + USB charger such as Aukey Swift Dual Port ( UK type Plug version ) is the best option. Such chargers come with two ports – one 12-watt USB port for fast charging your iPhone 6 and one 18-watt USB-C PD port for fast charging latest iPhones 12/11/XS/XR/8/8+ etc. in case you upgrade your phone in future. This allows you to fast-charge your iPhone 6 as well as all the latest iPhones such as iPhone 12, 12 Pro, 12 Mini, SE 2020, 11, 11 Pro/Max, 8, 8 Plus, X, XR, XS, XS Max etc. or any other phone that supports USB-C PD charging.
The USB-C PD phones are charged at a fast rate from zero to 50% in about 30 minutes by the USB-C PD charger such as Aukey Swift Dual Port ( UK type Plug version ) or the Anker Powerport PD 2 using a USB-C to Lightning cable. Of course, till you upgrade, you can charge your iPhone 6 at zero to 50% in 30 minutes.
Charge iPhone 6 faster with a QuickCharge 3.0/2.0 Charger or power bank
All QuickCharge 3.0 or 2.0 chargers also support 2.1 amp fast-charging for iPhone 6 as well. If you own any recent Samsung smartphone or a Quickcharge 3.0/2.0 phone such as LG G8, G7, V40, V30, etc. then you can use the Samsung/LG/Mi phone charger to fast-charge your iPhone 6 at its fastest charging speed. You can also use QuickCharge 3.0/2.0 power bank such as RAVPower 10000 QC 3.0 or Anker PowerCore Slim 10000 to fast charge your iPhone 6.
Charge iPhone 6 Quick with a 2.4 amp portable charger/power bank
Charging your iPhone 6 with a 2.4 amp portable charger is a very cost-effective solution, when you need power backup on the move or during travel. Power banks such as PowerCore Lite 10000 and PowerCore 20100 are our top recommendations as these charge as fast as a 2.4 amp wall charger and will fast-charge your iPhone 6 in the same time – from zero to half in about 30 minutes.
Power banks with QC 3.0/2.0 support such as RAVPower 10000 QC 3.0 or Anker PowerCore Slim 10000 will also fast-charge the iPhone 6. An extra benefit is that these power banks also fast charge the latest Samsung/Android phones as well.
Similarly, USB-C PD portable chargers such as PowerCore 1000 PD Slim 10000 will also fast-charge the iPhone 6 at its maximum possible speed. Such PD portable chargers are the most future-proof portable fast chargers for iPhone 6 as they will also fast-charge any PD compatible phone such as iPhone 11, 11 Pro/Max, XR, XS, etc. or Samsung S10, S9, etc. along with your iPhone 6. Here is our selection of best portable chargers for iPhone 6.
Charge iPhone 6 Fast with an iPad charger
iPhone 6 can also be charged from empty to fifty in 30 minutes by the any Apple iPad stock charger. This is because iPad charger charge at 10/12 watts.
iPhone Fast-Charge: What It Does and What It Does Not Do
iPhone 6 (as well as other iPhones) get fast-charged only till about 80% battery level. After that, the charging current drops drastically and it does not matter whether you use a 1 amp charger or 2 amp charger. This makes fast-charging in iPhone 6 most effective only when the battery is at a very low level. For example, iPhone 6 will get charged from empty battery to 50% in about 60 minutes by the standard iPhone charger but it will get fast-charge from zero to 50% in just 30 minutes from a 2.4 amp charger, saving half the charging time (30 minutes). Difference in charge durations will be much lower once you go above 60%.