You have finally decided to replace the tangle of wall plugs under your desk with a single compact charger, and now the spec sheets are throwing numbers at you: 65W, 100W, 140W, three ports, four ports, GaN this and PD that. The honest answer is that most Australians overbuy on wattage and underthink port layout. This guide explains what GaN actually changes, how to size total wattage for the devices you own, and how to read the fine print so you buy once and charge everything from one brick.
What GaN actually changes
GaN is short for gallium nitride, the semiconductor material used in the charger's internal switching components in place of traditional silicon. It runs cooler and switches faster, which lets manufacturers pack the same power into a much smaller, lighter housing. A 65W GaN charger can be roughly the size of the old 20W brick that shipped with your phone, which is why a single GaN unit can realistically replace several older plug packs.
The important thing to understand is that GaN is about efficiency and size, not magic extra speed. A 30W GaN charger and a 30W silicon charger deliver the same power to your phone. What GaN buys you is the ability to have multiple high-power ports in a brick small enough to leave in your bag. If you want the full background on charging standards and how they interact, our complete guide to phone charging in Australia is the best place to start.
How to size total wattage
The number printed on the front of the box is the charger's total output, and on multi-port units that total is shared across the ports. The trap is assuming a 100W charger gives 100W to each port. It does not. It gives 100W total, split according to how many ports are in use and the charger's internal power-sharing rules.
Work out your real peak load
Add up the wattage of the devices you would realistically charge at the same time, not everything you own. A rough Australian household kit looks like this:
- Modern smartphone: 20 to 30W to hit its fastest rate.
- Tablet such as an iPad: 20 to 35W depending on the model.
- Wireless earbuds case: around 5W and slow to draw.
- 13-inch laptop or ultrabook: 45 to 65W.
- 16-inch or performance laptop: 90 to 140W.
If your peak scenario is a phone plus earbuds plus a tablet on the kitchen bench, a 65W three-port charger has ample headroom. If you want to run a 14-inch laptop and still fast-charge a phone next to it, look at 100W. Reserve 140W for large laptops that genuinely ask for it, and check that the charger delivers that figure from a single USB-C port rather than only as a shared total.
Ports and power sharing
Port count matters as much as raw wattage. A neat trick is to picture the worst case: every port occupied at once. Read the manufacturer's power-distribution table, which most reputable brands print. It will say something like single port 100W, two ports 65W plus 30W, three ports 45W plus 30W plus 20W. That table tells you whether the charger can actually run your laptop and phone together at full speed or whether it quietly throttles the laptop when you plug in a second device.
USB-C versus USB-A
Favour USB-C ports. USB Power Delivery, the standard that negotiates high-wattage fast charging, runs over USB-C. A USB-A port on a modern charger is fine for legacy cables and slow trickle charging, but it caps out well below what a current phone can accept. For a future-proof desk charger, three or four USB-C ports beats a mix that wastes a slot on USB-A. You can browse suitable multi-device units in our phone, tablet and laptop chargers collection.
Australian safety and the plug
Any charger you plug into a wall here must handle the Australian mains supply of 230 to 240V at 50Hz and carry the correct approval marking. Look for the Regulatory Compliance Mark and evidence that the model meets Australian electrical safety rules. Cheap unbranded bricks bought from overseas marketplaces sometimes ship with a US or EU pin layout and an adaptor, which is both inconvenient and a genuine safety risk. Buy a unit with fitted Australian pins from a seller who stands behind it under Australian Consumer Law.
It is also worth remembering that a quality charger is a safety component, not just a convenience. Poor internal isolation is exactly the sort of fault that matters on our higher-voltage supply. For more on certification and what the markings mean, see our explainer on whether phone chargers sold in Australia need to be certified.
Matching the cable to the charger
A common and frustrating mistake is pairing a powerful GaN charger with a weak cable. A cable rated for only 60W will refuse to carry 100W, so your laptop charges slowly no matter how good the brick is. For anything above 60W you generally need a cable rated to 100W, or a 240W cable with an E-marker chip inside the connector. If a device is charging slower than expected, the cable is the first thing to swap. Our guide to why not all USB-C cables charge at the same speed walks through exactly what to look for.
Choosing the right size for how you live
Desk and home
A 65W to 100W three or four-port GaN charger is the sweet spot for most homes. It clears a bench of individual plugs, charges a phone, tablet and laptop, and leaves a spare port for a visitor. You do not need to leave the house with this one, so a slightly larger body is fine.
Travel and road trips
For a carry-on or a long drive between regional towns, a two-port 65W unit is compact, light and covers a phone and a small laptop. Australian distances mean you may go a while between reliable power points, so a dependable brick paired with a good cable earns its place in your bag. If you are heading somewhere without mains power at all, a charger is no help; pair it with a power bank instead, and remember that both belong in your carry-on rather than checked luggage when you fly.
Common mistakes to avoid
A few buying and usage errors trip people up again and again. Steering clear of them saves both money and frustration.
- Buying for the headline number: a 140W badge on the box means little if you only ever charge a phone and earbuds. Match the charger to your real devices, not the biggest figure on the shelf.
- Ignoring the cable: the fastest brick in the world is capped by the weakest cable attached to it. Budget for a properly rated cable alongside the charger.
- Assuming ports are equal: on many chargers one USB-C port is the high-power one and the rest are lower. Plug your laptop into the port marked for it, not just any free socket.
- Trusting no-name imports: a brick with a foreign plug and an adaptor, no brand and no compliance mark is a false economy on our 230 to 240V supply. Spend a little more for a unit that carries the Regulatory Compliance Mark.
Get those four things right and a single GaN charger will quietly serve your whole household for years, replacing a drawer of mismatched plugs with one tidy, dependable brick.
Frequently Asked Questions
Does a higher-wattage GaN charger charge my phone faster?
No. Your phone only draws the maximum wattage it is designed to accept, usually 20 to 30W, so a 100W charger charges it at exactly the same speed as a 30W one. The extra capacity is only useful when you charge several devices at once or add a laptop.
Can one GaN charger really replace my laptop charger?
Usually yes, provided it delivers enough single-port wattage for your laptop, typically 65W for an ultrabook or up to 140W for a large machine, and you use a cable rated to match. Check the single-port figure in the power table rather than the total.
Is it safe to leave a GaN charger plugged in all the time?
A quality, Australian-approved GaN charger is designed to sit connected safely and draws almost nothing when nothing is charging. Choose a unit carrying the Regulatory Compliance Mark and avoid unbranded imports with foreign pins and adaptors.
Why does my laptop charge slowly when my phone is also plugged in?
Because the total wattage is shared. When a second device is connected the charger reallocates power according to its distribution rules, so the laptop may drop from 100W to 65W. If that matters to you, buy a higher total wattage or use separate ports for high-draw devices.
Do I need USB-C, or will USB-A do?
For fast charging a modern phone, tablet or laptop, choose USB-C, because USB Power Delivery runs over USB-C. USB-A ports are only worth having for older cables and slow trickle charging.
Ready to swap a drawer full of plugs for one tidy brick? Browse our range of multi-port and GaN options in the phone, tablet and laptop chargers collection and pick the wattage that matches your real-world kit.