Charge your Anker portable charger with the USB cable that came in the box

Anker portable chargers come with a USB cable already included — usually a USB-C to USB-C cable or a USB-A to USB-C cable, depending on the model. Plug the USB end into any power adapter (the kind you use for your phone), then plug the other end into the port on your Anker charger. The LED lights on the front will show you how full the battery is as it charges. Most Anker chargers take between two and four hours to reach full capacity, though larger models may take longer.

You do not need to buy a separate cable or adapter. If you have lost the original cable, any USB-C cable will work with modern Anker models, and any standard USB power adapter rated for at least 5 watts will charge it safely. Avoid using very old or damaged cables, as they charge more slowly and can damage the charger's battery over time.

Key Takeaways

  • Use the USB cable that came with your Anker charger, plugged into any standard phone power adapter.
  • The LED lights on the front show battery level — watch them to know when charging is complete.
  • Charging time ranges from two to four hours depending on the charger size and the power adapter you use.
  • You can charge your Anker charger while it is charging your phone, though this slows both processes down.
  • Unplug the charger when it reaches full capacity to avoid wearing out the battery.

Understanding the LED lights on your charger

Every Anker portable charger has LED indicator lights — usually four small dots or a bar on the front. Each light represents roughly 25 percent of the battery. When you plug in the charger, the lights will turn on and show how much power is stored inside. As the charger fills up, more lights will turn on from left to right. When all lights are on, your charger is fully charged and ready to use.

Some Anker models have a button next to the lights. Press it anytime to check the current battery level without plugging anything in. This is useful before you leave home — you can see at a glance whether the charger has enough power for your trip. If only one or two lights are on, the charger needs more time to charge before you take it with you.

Charging times for different Anker models

Smaller Anker chargers (5,000 to 10,000 mAh) typically charge in two to three hours using a standard 5-watt phone adapter. Medium chargers (20,000 to 25,000 mAh) take three to four hours. Larger models (30,000 mAh and above) may take five to six hours or longer. The time also depends on the power adapter you use — a 10-watt or 18-watt adapter will charge your Anker charger faster than a 5-watt one.

If you are in a hurry, use the highest-wattage adapter you have available. Most Anker chargers support fast charging and will accept power from any adapter rated between 5 and 30 watts. Check the label on your adapter to see its wattage, or look at the specifications on the back of your Anker charger box to confirm what it supports.

Charging your phone while the charger is charging

You can plug your phone into your Anker charger while the charger itself is plugged into a wall outlet. This works, but both devices will charge more slowly because the charger is splitting its power between filling its own battery and powering your phone. If you need your phone charged quickly, charge the Anker charger first until it is full, then unplug it from the wall and use it to charge your phone.

This setup is most useful when you are at home or at a desk and do not need either device right away. Plug everything in and let it sit for a few hours. By the time you are ready to leave, both your phone and your Anker charger will be fully charged.

Where to charge your Anker charger safely

Charge your Anker charger in a cool, dry place away from direct sunlight and heat sources like radiators or ovens. Do not charge it in a car on a hot day or in a bathroom where moisture is high. Extreme heat and humidity can damage the battery inside and shorten how long the charger will last. A bedroom outlet, kitchen counter, or office desk are all good choices.

Keep the charger away from water and do not attempt to charge it if it is wet. If your charger gets wet, let it dry completely in a cool place for at least 24 hours before plugging it in. Most Anker chargers have some water resistance, but they are not waterproof, and charging a wet device can cause a short circuit.

Maintaining your Anker charger battery over time

Unplug your Anker charger as soon as it reaches full capacity. Leaving it plugged in after it is fully charged does not damage it when ready, but it does wear out the battery faster over months and years. Think of it like leaving your phone plugged in overnight every night — it works fine, but the battery will not last as long as it would if you unplugged it when it was full.

Charge your Anker charger at least once every three months, even if you are not using it. Batteries lose power naturally over time, and letting a charger sit completely empty for too long can damage the battery permanently. If you store your charger for the winter or for a long trip, charge it to about 50 percent and store it in a cool place. This keeps the battery healthy and ready to use when you need it again.

Troubleshooting a charger that will not charge

If your Anker charger is not charging, first try a different USB cable. The cable that came with the charger can wear out or break, and a damaged cable is the most common reason a charger appears to be broken. Borrow a USB-C cable from a friend or use one from another device if you have it. If the charger charges with a different cable, you know the original cable needs to be replaced.

Next, try a different power adapter. Some older adapters do not provide enough power, or they may be faulty. If you have a phone charger rated for 10 watts or higher, use that instead. Plug the charger in for at least 30 minutes — sometimes a completely drained Anker charger takes longer to show signs of charging. If the LED lights still do not turn on after 30 minutes with a known-good cable and adapter, the charger itself may have a hardware problem and may need to be replaced.

Frequently Asked Questions

Can I use any USB power adapter to charge my Anker charger?

Yes. Any standard USB power adapter rated between 5 and 30 watts will work safely with your Anker charger. A 5-watt adapter (the kind that comes with many phones) will charge it, but a 10-watt or 18-watt adapter will charge it faster. Do not use adapters rated above 30 watts, as they may damage the charger's battery.

How do I know when my Anker charger is fully charged?

All four LED lights on the front will be on when the charger is full. Some models have a button you can press to check the battery level anytime. Once all lights are on, unplug the charger from the wall to avoid wearing out the battery.

Is it bad to leave my Anker charger plugged in overnight?

It is not dangerous, but it does wear out the battery faster over time. Unplug the charger as soon as it reaches full capacity. If you forget occasionally, it is not a problem — just make it a habit to unplug it when you remember.

Why is my Anker charger charging very slowly?

A slow-charging charger usually means the cable or power adapter is weak or damaged. Try a different USB cable first, then try a different power adapter. If you are charging your phone at the same time, unplug your phone — the charger will fill up faster when it is not powering another device.

Can I charge my Anker charger in a car?

Yes, you can use a car USB adapter to charge your Anker charger while driving. However, do not leave the charger in a hot car for long periods, as heat damages the battery. Charge it while the car is running and the air conditioning is on, or charge it at home before you travel.