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 about twice the speed of the stock Apple iPhone 6 charger.
The new iPhone 12 series phones (as well as new iPhone 11 series/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 such as Anker PowerPort PD2 Dual Port ( UK type Plug version ). This will fast-charge your iPhone 6 at twice the speed of Apple charger now and fast-charge your future iPhone 12/12 Pro/12 Mini/11/XR/SE 2020 etc. at 20-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 lowest cost 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 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 half the time taken by 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 Anker PowerPort 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 Anker 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 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 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 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 12, 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 all iPad adapters will charge at minimum 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%.