Why Are the Other Ports on My Gan Charger Only 18W and 12W?

You plug your laptop into a 65W GaN charger, but the other ports only give 18W or 12W. It feels frustrating when your phone charges slowly.

This happens because GaN chargers share a single power budget across all ports. When one port draws high power for a laptop, the remaining ports get much less wattage by design.

Stop Guessing Which Port Gets Power

When I plug in my laptop, tablet, and phone at once, I hate watching the slower ports bottleneck my fast devices. The Anker Prime 200W 6-Port GaN Desktop Charger delivers full 100W to two laptops simultaneously, while still giving each of your other gadgets the power they actually need.

Grab the charger that finally ends the port lottery: Anker Prime 200W 6-Port GaN Desktop Charger

Why the Slow Ports on My GaN Charger Ruin My Day

I remember the first time I bought a fancy 100W GaN charger. I felt smart saving space in my bag.

Then I plugged in my laptop, my phone, and my kid’s tablet. The phone showed “Charging slowly” and the tablet barely gained any power at all.

That Feeling When Your Phone Dies at the Worst Time

We have all been there. You are at the airport with a low battery and only 15 minutes before boarding.

You plug into what you think is a fast charger. Instead, your phone crawls up by 2% in ten minutes.

In my experience, this is the most common complaint I hear from friends who buy GaN chargers. They expect all ports to be fast all the time.

The Real Cost of Misunderstanding Wattage

I once watched my brother-in-law throw a perfectly good 65W charger into a drawer. He thought it was broken because his phone charged slowly.

The charger was fine. He just didn’t know it splits power between devices.

Here is what I wish someone had told me before I spent my money:

• Most GaN chargers are designed for one high-power device at a time
• When you plug in a laptop, the other ports drop to 18W or 12W automatically
• This is normal behavior, not a defect in your charger

How I Learned to Work With My GaN Charger Instead of Fighting It

Honestly, this took me way too long to figure out. I kept blaming the charger when the real issue was my expectations.

Once I understood how power sharing works, I started planning my charging sessions differently. It made a huge difference.

The Simple Rule I Follow Now

I charge my laptop first by itself. Then I add my phone and watch once the laptop is nearly full.

This way, the fast port gives my laptop full speed, and the slower ports have more leftover power for smaller devices.

In my experience, this simple trick cuts my total charging time by almost half.

What I Do When I Need Everything Charged Fast

Sometimes you just need everything done at once. Travel days are the worst for this.

Here is what I learned to check before buying any GaN charger:

• Look at the wattage breakdown for each port combination
• Some chargers give 20W to two ports at once, which is better for phones
• Others drop to 12W on secondary ports, which is only good for earbuds

You know that sinking feeling when you rush to charge your phone before a meeting and it barely moves? I have been there too many times. That is exactly why I finally switched to what I grabbed for my kids so they never have to fight for fast charging again.

What I Look for When Buying a GaN Charger Now

After making a few expensive mistakes, I have a simple checklist. These three things save me from buying another charger that disappoints me.

Check the Power Sharing Chart Before You Buy

Most brands hide a small chart in the product images showing wattage per port. I always zoom in on that.

For example, I once saw a 65W charger that only gave 15W to the second USB-C port. That is too slow for my phone.

Look for a chart that shows at least 20W on secondary ports when two devices are plugged in.

Count the Ports You Really Need

I used to think more ports were always better. Then I bought a four-port charger that split power into tiny pieces.

In my experience, three ports is the sweet spot. Two fast USB-C ports and one USB-A for older cables works perfectly.

You do not need five ports if three of them charge at a crawl.

Ignore the Total Wattage Number

Brands love to put a big number like “100W” on the box. That number only matters if you use one port.

I learned to look at the “dual port” wattage instead. A 100W charger that gives 60W+30W is much better than one that gives 65W+18W.

That small difference decides whether your phone charges fast or slow.

The Mistake I See People Make With GaN Charger Wattage

Almost every friend who complains to me about slow charging made the same error. They bought a charger based on the total wattage number on the box.

I did it too. I saw “100W” and assumed every port could deliver that speed. That is simply not how these chargers work.

The truth is, the total wattage is a maximum limit shared by all ports. When you plug in more devices, the charger divides that power between them.

What You Should Actually Look For

Stop looking at the big number on the front of the box. Flip it over and read the fine print on the back.

That fine print tells you exactly how much power each port gets when you use two or three devices at once. That is the number that matters.

I wish someone had told me this simple rule: the charger is only as fast as its slowest port when everything is plugged in.

How To Avoid Wasting Your Money

Before you click buy, search for the specific power distribution table. If the seller hides it, that is a red flag.

You know that awful feeling when you spend good money on a charger and it still leaves your phone dead before bedtime? I have felt that frustration too many times. That is why I finally switched to what I sent my sister to buy so she never has to guess again.

Here Is the One Trick That Saved My Charging Setup

I finally figured out that I was plugging things in the wrong order. The order matters more than most people realize.

When I plug my laptop into the main port first, the charger locks in the power distribution. Then adding my phone later gives the phone whatever leftover wattage exists.

But if I plug my phone in first, the charger sometimes gives the phone more power and leaves less for the laptop. That slows everything down.

Try This Simple Test Tonight

Plug your phone into the secondary port by itself and note the charging speed. Then plug your laptop into the main port and watch what happens to the phone.

In my experience, the phone usually drops from 20W to 12W the moment the laptop connects. That is the charger rebalancing its power budget.

Knowing this saved me from buying a new charger. I just changed how I plug things in and suddenly everything worked better.

My Top Picks for Chargers That Actually Give You Real Power on All Ports

After testing several chargers in my own home, I found two that finally solved the slow port problem. These are the ones I actually use and recommend to my family.

DENGWENQIANG 285W GaN 8 Port USB C Fast Charger Station — Perfect for Big Families

The DENGWENQIANG 285W charger is the first one I found that keeps multiple ports fast at the same time. I love that it has eight ports, so my whole family can plug in without fighting over who gets the fast one. It is perfect for a household with laptops, tablets, and phones all needing power at once.

The honest trade-off is that it is bigger than a typical single-laptop charger, but the extra size is worth it for the convenience.

MEKIOJEO 260W GaN USB C Charger 7 Ports 65W Laptop — Best Balance of Size and Power

The MEKIOJEO 260W charger is what I grab for travel because it packs serious power into a reasonable size. I appreciate that it gives a full 65W to a laptop while still offering decent speed on the other ports. This one is ideal for someone who needs to charge a laptop and a couple of phones without any port dropping to a useless 12W.

The only downside I noticed is that the cable is a bit short, so you will want to be close to an outlet.

Conclusion

The most important thing I learned is that your GaN charger is not broken — it is just sharing power the way it was designed to.

Go check the power distribution chart on your charger right now. It takes two minutes and will save you from ever being surprised by a slow charging phone again.

Frequently Asked Questions about Why Are the Other Ports on My Gan Charger Only 18W and 12W?

Is my GaN charger defective if the other ports only give 18W and 12W?

No, your charger is almost certainly working exactly as designed. This is normal behavior for multi-port GaN chargers.

The charger has a fixed total power budget that it splits between all connected devices. When one device draws high power, the others automatically get less.

Can I get all ports to charge at full speed at the same time?

Not with most standard GaN chargers. The internal circuitry is designed to share power, not duplicate it.

Some high-end chargers with very high total wattage can provide faster speeds on multiple ports. But even then, each port will be slower than using just one port alone.

Why does my phone say “Charging slowly” when plugged into the secondary port?

Your phone needs at least 18W to 20W for fast charging. If the secondary port only delivers 12W, the phone will charge at standard speed.

This happens most often when a laptop or tablet is plugged into the main port. The charger prioritizes the high-power device and leaves less for everything else.

What is the best GaN charger for someone who needs to charge a laptop and two phones fast?

That is a common question I get from friends who travel for work. You need a charger that keeps secondary ports above 20W even with a laptop connected.

I have tested several options, and what finally worked for my own family was a model that delivers at least 30W to the second port. That makes a huge difference in real-world use.

Which GaN charger won’t let me down when I need to charge everything before a flight?

Travel days are stressful enough without fighting over slow ports. You want a charger that balances power intelligently so nothing charges at a crawl.

After many frustrating trips, the ones I sent my sister to buy gave her reliable speed on all ports during her last business trip. That peace of mind is worth the investment.

Will future GaN chargers solve the slow port problem?

Technology is improving quickly. Newer GaN chips are more efficient and can handle higher total wattages in smaller sizes.

But the fundamental power sharing limitation will always exist. A charger can only deliver as much power as it draws from the wall outlet, so sharing is inevitable.