GaN Chargers Explained: One Brick for Everything

There is a specific drawer in most homes that contains eight chargers and none of the right one. A thick laptop brick from an old machine, a slim phone charger that will not wake a laptop, two mystery cubes with no markings, and a tangle of cables that all look identical. The problem is not that you own too few chargers. It is that you own too many, and none of them is flexible enough to do the job when you actually need it.

That drawer is the reason gallium nitride chargers exist as a category. But the marketing around them hides a detail that trips up almost everyone: a 100 W charger is not three 100 W chargers. Understanding that single fact is most of what you need to buy the right one.

Why gallium nitride changed the size

A charger converts the alternating current from your wall socket into the direct current your devices need, and that conversion wastes some energy as heat. Traditionally the switching components inside were made of silicon. Gallium nitride, usually shortened to GaN, is a semiconductor material that can switch at higher frequencies and tolerate higher temperatures than silicon. That lets a charger use smaller internal components, and smaller components mean a smaller body for the same output.

For you, the practical result is simple: a GaN charger rated for laptop-level power can be roughly the size of the phone charger you already own. Based on published specifications, the smallest 100 W GaN units are small enough to fit a jacket pocket, which is what makes the “one brick for everything” idea possible in the first place.

What GaN does not do is change the physics of the socket, the cable, or the device you are charging.

How USB-C Power Delivery actually negotiates

USB-C is not a fixed standard where everything just works at the same speed. When you plug a device into a USB-C charger, the two do a short negotiation. The charger advertises the voltage and current combinations it can supply. The device asks for one of them, up to whatever its own charging circuitry will accept. If both sides agree, power flows.

This is called USB Power Delivery, and it explains three things people find confusing:

• A 100 W charger will not force 100 W into a phone. The phone asks for what it can take.
• A device can be limited by its own maximum, no matter how large the charger is.
• A charger that does not support the right voltage tiers may fall back to a slow, safe default.

The negotiation only works if the cable is also capable. That is a separate topic, and it is the most common reason a laptop charges slowly from a good charger.

The detail nobody reads: total wattage is shared

Here is the part the packaging does not put in large print. The wattage on the box is the total the charger can supply across all of its ports at once — not the amount each port receives.

Situation	The honest expectation
One device on a 100 W charger	That device can draw close to the charger’s full rating, if it supports it
Two devices	The same 100 W is now the budget for both, split by the charger’s published allocation
Three devices	Still 100 W in total, shared three ways
A laptop plus a phone	The laptop is usually prioritised, but it may sit below its own maximum while both are connected

The exact split differs between models and is printed in the specifications. Some chargers prioritise the first port; others divide the total more evenly. If a laptop needs a specific wattage to charge at full speed, a three-way split may drop it below that line, and it will slow down rather than fail.

Rule of thumb: buy a charger for the single biggest device you own, then treat every additional port as a bonus. A charger sized for your laptop will still charge your phone and earbuds happily at the same time. A charger sized for your phone will never charge your laptop.

When one charger genuinely replaces three

The promise holds up in one specific situation: you travel with a laptop, a phone and a pair of earbuds, and you would rather carry one brick than three. In that case a 100 W GaN charger does replace the pile, as long as you accept that the laptop may charge more slowly when everything is connected at once.

The three models below cover the realistic ways people end up here.

Anker Prime 100W GaN Charger — the model to shortlist if you want the neatest possible version of the idea. Based on published specifications it carries multiple USB-C and USB-A ports, foldable prongs and intelligent power distribution across ports. It is compact for its wattage and built solidly. What you give up is money, since this sits at the premium end, and the fact that it still runs warm under sustained load, like any charger pushing high wattage through a small body.

UGREEN Nexode 100W — delivers most of the same practical outcome for noticeably less. It is a 100 W GaN charger with multiple USB-C ports plus USB-A, and it charges a laptop without complaint. The finish is plastic rather than premium, it shows marks, and the port allocation is a little less clever than the Anker’s. If you want one charger for a desk and do not care how it looks, this is the sensible buy.

Anker 312 Travel Adapter — the odd one out, and included deliberately. If you travel to the same country repeatedly, a single-region adapter with USB-C and USB-A ports is smaller, lighter and simpler than a universal one. It is not a high-wattage charger, so it will not run a laptop at full speed, and it does not convert voltage. Check the plug type and mains voltage of your destination, and if you are unsure how a device will behave on a foreign supply, ask a qualified electrician rather than guessing.

What not to overpay for

• A higher wattage than your biggest device needs. If your laptop’s published maximum is lower than the charger’s rating, the extra capacity only matters when several devices are connected.
• Port count for its own sake. Four ports you never fill are four ports sharing a budget.
• A branded cable bundle. Chargers rarely fail on the cable; the cable is where you should spend deliberately, but not blindly.
• App features. Some chargers report live wattage to a phone. It is a nice-to-have, not a reason to choose one model over another.

When you should not buy anything

If your current charger already fills your laptop overnight and your phone during the day, and you are not travelling with both, a new GaN charger changes nothing except the contents of the drawer. The honest case for buying one is portability: a single small brick that replaces three, for someone who actually carries the three.

Prices move constantly and vary between retailers, so confirm the current figure with the merchant before you decide.