The feeling of plugging your iPhone into an Anker charger and seeing slow charging can be frustrating. You expect quick power, but your battery creeps up slowly. This problem is common and can have many causes—some easy to fix, others less obvious.
If you’re wondering, “Why is my Anker iPhone charger not fast charging? ”, this guide will help you understand the reasons and solutions. Whether you’re using an Anker wall charger, USB-C cable, or wireless pad, we’ll break down the main factors affecting charging speed and give practical advice.
How Fast Charging Works On Iphones
Fast charging means your phone’s battery charges much quicker than standard methods. With newer iPhones, fast charging can take your battery from 0% to 50% in about 30 minutes. But not every charger or cable supports fast charging.
Apple’s fast charging uses USB Power Delivery (USB PD) technology. To get fast charging, you need:
- An iPhone that supports fast charging (iPhone 8 or later)
- A charger with at least 18W output and USB PD support
- A USB-C to Lightning cable
Anker makes many chargers and cables with these features, but not all models are equal. If your charging is slow, it’s likely something in this chain isn’t working as expected.
Common Reasons Anker Chargers Don’t Fast Charge Iphones
1. Charger Wattage Is Too Low
One of the most frequent causes is using a charger with insufficient wattage. Fast charging needs at least 18W, but some Anker models, especially older or budget versions, deliver less.
Look for these numbers:
- 5W: Standard charging (slow)
- 10W: Slightly faster, but still not “fast charging”
- 18W or above: Fast charging
If your charger is only 5W or 10W, your iPhone will charge slowly.
Quick Comparison
Here’s how different wattages affect charging time:
| Charger Wattage | 0-50% Charge Time | Supports Fast Charging? |
|---|---|---|
| 5W | ~60 minutes | No |
| 10W | ~45 minutes | No |
| 18W | ~30 minutes | Yes |
| 20W+ | ~28 minutes | Yes |
Insight: Many people assume all USB wall chargers are fast. But only those marked 18W or higher (with USB PD) provide true fast charging.
2. Cable Type And Quality
Your charging cable matters as much as the charger itself. For fast charging, you need a USB-C to Lightning cable—not a regular USB-A to Lightning cable.
- USB-A to Lightning: Does not support fast charging.
- USB-C to Lightning: Supports fast charging.
Anker sells both types. If you use the wrong cable, your iPhone will default to slower speeds.
Common Mistake: Using a high-wattage charger with an old USB-A cable and wondering why charging is slow.
Cable Comparison
| Cable Type | Supports Fast Charging? | Typical Use |
|---|---|---|
| USB-A to Lightning | No | Older chargers |
| USB-C to Lightning | Yes | Modern fast chargers |
| Wireless | No | Convenience, not speed |
3. Charger Compatibility
Not all Anker chargers support USB Power Delivery (PD). Fast charging depends on this technology. Even if the charger is rated 18W or higher, it must support USB PD.
How to check compatibility:
- Look for “USB PD” or “Power Delivery” on the charger or packaging.
- If it says only “Quick Charge” (QC), that’s a different standard. IPhones don’t use QC.
Non-obvious insight: Some Anker chargers have multiple ports, but only one supports fast charging. Always use the correct port.
4. Software And Battery Health Issues
Your iPhone’s software and battery health can affect charging speed. If your battery is degraded or software is buggy, charging may slow down.
- Check battery health in Settings > Battery > Battery Health.
- Update iOS to the latest version.
If battery health is below 80%, fast charging may not work well.
Practical tip: Restart your phone and try charging again. Sometimes, software glitches slow down charging.
5. Using Wireless Charging Pads
Anker wireless pads are convenient, but wireless charging is always slower than wired fast charging. Most Anker pads deliver 7. 5W to iPhones, which is not “fast charging” by Apple’s definition.
Wireless pads are great for overnight charging, but if you want speed, use a wired USB-C charger.
6. Background Activities And High Temperatures
If your iPhone is hot or running intensive apps, it may slow charging to protect itself. High temperatures reduce charging speed to prevent damage.
- Avoid charging in direct sunlight.
- Close unused apps during charging.
Data point: iPhones throttle charging above 95°F (35°C) to protect the battery.
7. Damaged Or Poor-quality Accessories
Old or damaged cables and chargers can cause slow charging. Even genuine Anker products can wear out over time.
Signs of wear:
- Frayed cables
- Loose connectors
- Charger feels hot
Replace accessories if you notice these problems.
Beginner mistake: Assuming “it’s just a cable” and ignoring damage.
8. Power Source Issues
The outlet or USB port you use matters. If you’re charging from a computer or low-power USB port, speed will be slow. Use a wall outlet for best results.
- Wall outlet: Full speed
- Computer USB: Slow or unreliable
Non-obvious insight: Some power strips limit USB output to 5W. Always check the specs.
How To Identify The Cause Of Slow Charging
Solving slow charging is easier if you follow a clear process. Here’s a practical approach:
- Check Charger Wattage: Look at the charger label for “18W,” “20W,” or “USB PD.”
- Inspect the Cable: Make sure you have a USB-C to Lightning cable.
- Test Different Accessories: Try another charger or cable if possible.
- Check Battery Health: Go to Settings and review battery health.
- Try a Wall Outlet: Avoid charging from computers or power strips.
- Observe Charging Speed: Use the iPhone battery widget to track charge rate.
If you still have issues, move to deeper troubleshooting.
Troubleshooting Steps For Anker Iphone Charger Issues
Step 1: Confirm Fast Charging Support
Make sure your iPhone model and charger support fast charging.
- IPhone 8 or newer: Supports fast charging
- Charger: 18W+ with USB PD
- Cable: USB-C to Lightning
Step 2: Test Accessories Separately
Try your charger with another iPhone, or your cable with another charger. This helps you identify which part is faulty.
Step 3: Inspect For Damage
Look for physical damage on the charger, cable, and iPhone port. Clean the port gently with compressed air or a soft brush.
Step 4: Update Software
Update your iPhone to the latest iOS. Sometimes, software bugs affect charging.
Step 5: Monitor Charging Conditions
Charge in a cool, dry place. Avoid using the phone while charging.
Step 6: Reset Settings (if Needed)
If nothing works, reset network settings (Settings > General > Reset > Reset Network Settings). This can clear software conflicts.
Practical tip: If you still have issues, contact Anker support or Apple for help.
Comparing Anker Chargers: Which Models Fast Charge Iphones?
Not every Anker charger is designed for fast charging. Here’s a quick comparison of popular models:
| Anker Model | Wattage | USB PD Support | Fast Charging for iPhone? |
|---|---|---|---|
| Anker PowerPort III Nano | 20W | Yes | Yes |
| Anker PowerPort II | 24W (2 ports) | No | No |
| Anker PowerPort III Duo | 18W (each port) | Yes | Yes |
| Anker Wireless Pad | 7.5W | No | No |
| Anker PowerCore (Power Bank) | 18W+ | Yes (some models) | Yes (with USB-C PD) |
Experience-based tip: Always check the specs before buying. Look for “USB PD” and the correct wattage.
Real-world Examples And Data
Example 1: Charging Iphone 13 With Powerport Iii Nano
Using a 20W Anker PowerPort III Nano with a USB-C to Lightning cable, the iPhone 13 charges from 0% to 50% in about 28 minutes—matching Apple’s fast charging claims.
Example 2: Using Usb-a Charger
With an old 5W USB-A Anker charger and a USB-A to Lightning cable, the same iPhone 13 takes nearly 60 minutes to reach 50%. No fast charging.
Example 3: Wireless Charging
Using an Anker wireless pad, the iPhone 13 charges to 50% in about 80 minutes. Wireless is convenient but much slower.
Example 4: Faulty Cable
A user notices their new Anker charger is fast, but charging is slow. The USB-C to Lightning cable is frayed. Replacing the cable restores fast charging.
Example 5: Charging From Laptop Usb
Charging from a laptop USB port delivers only about 2. 5W. The iPhone charges very slowly, sometimes not at all.
Data: Iphone Charging Speeds
Here’s some charging speed data for recent iPhone models using different Anker chargers:
| iPhone Model | Charger Type | 0-50% Charge Time | Max Supported Wattage |
|---|---|---|---|
| iPhone 13 | 20W USB-C PD | ~28 minutes | 20W |
| iPhone 12 | 18W USB-C PD | ~30 minutes | 18W |
| iPhone 11 | 5W USB-A | ~60 minutes | 18W |
| iPhone SE (2020) | 20W USB-C PD | ~30 minutes | 18W |
Insight: Even if your charger is higher wattage, iPhones will only draw their maximum supported power (usually 18-20W).
How To Ensure Fast Charging With Your Anker Charger
Follow these steps for reliable fast charging:
- Use the right charger: Minimum 18W, USB PD support.
- Use a USB-C to Lightning cable: Genuine Anker or Apple.
- Plug into a wall outlet: Avoid computers or power strips.
- Keep your phone cool: Don’t charge in hot environments.
- Update iOS: Keep software current.
- Check battery health: If degraded, consider battery replacement.
Non-obvious tip: If you use a power bank, make sure it supports USB PD and use the correct cable.
When To Replace Your Charger Or Cable
If your charger or cable is old, damaged, or not working well, replace them. Signs you need to upgrade:
- Slow charging despite correct setup
- Charger or cable feels hot
- Frequent disconnects
- Visible damage
Experience-based tip: Buy certified accessories. Anker’s PowerLine series is reliable for cables.
Avoiding Common Mistakes
Many users make mistakes that slow charging:
- Mixing USB-A and USB-C accessories
- Using non-PD chargers
- Ignoring battery health
- Charging from low-power sources
Practical advisor tip: Always check the specs on both charger and cable. Fast charging needs the right combination.
Should You Use Wireless Charging?
Wireless charging is convenient but slower. Anker pads are good for overnight charging, but not for fast top-ups. If speed matters, stick with wired charging.
Data point: Wireless charging is about 2-3 times slower than wired fast charging.
The Role Of Battery Health And Software
Battery health affects charging speed. If your battery is degraded, your phone may not fast charge. Software issues can also cause slow charging.
- Battery health below 80%: Slow charging likely
- Outdated iOS: May cause bugs
Friendly mentor tip: Check battery health regularly and update software.
What To Do If None Of These Fixes Work
If you’ve tried all steps and your Anker charger still doesn’t fast charge:
- Try another charger/cable
- Test another device
- Contact Anker support
- Visit Apple Store for battery check
Sometimes, the issue is with the phone, not the charger.
Frequently Asked Questions
Why Does My Anker Charger Charge My Iphone Slowly?
The most common reasons are using a charger below 18W, not using a USB-C to Lightning cable, or plugging into a low-power source. Check the charger specs and cable type. Battery health and temperature also affect speed.
How Can I Tell If My Charger Supports Fast Charging?
Look for “USB PD” (Power Delivery) and wattage (18W or higher) on the charger. Anker models like PowerPort III Nano and PowerPort III Duo support fast charging.
Is Wireless Charging With Anker Fast?
No, wireless charging delivers 7. 5W to iPhones, which is much slower than wired fast charging. It’s good for convenience, not speed.
Can Battery Health Affect Charging Speed?
Yes. If your battery health is below 80%, fast charging may not work well. Check battery health in Settings > Battery > Battery Health.
What Should I Do If My Anker Charger And Cable Are Correct But Charging Is Still Slow?
Try charging in a cooler place, update your iPhone’s software, and check battery health. If everything seems right and charging is slow, test another charger or cable. If the problem continues, contact Anker or Apple support.
If you want official charging specs or more data, visit Apple Support.
Choosing the right Anker charger and cable makes a big difference for your iPhone’s charging speed. Now you know how to spot issues and fix them. Fast charging should be easy—if it’s not, follow these steps and you’ll get back up to speed.
