Anker Prime 100W Review: 100 W Is the Total, Not the Port
A 100 W charger sounds like it means 100 W. On a three-port charger it almost never does, and how it splits is the whole decision.
A 100 W charger sounds like it means 100 W. On a three-port charger it almost never does, and the way that number splits when you plug in a second device is the only thing that separates a good multi-port charger from a frustrating one.
This is a research-based buying guide, not a hands-on test. It is built from Anker’s published specification and independent reporting. Read our review standards.
The short answer
Buy it if one plug has to charge a laptop and a phone at once. Either USB-C port can deliver the full 100 W on its own, which means it charges a 14-inch laptop at full speed when nothing else is attached.
The thing to understand is sharing. 100 W is the total, not the per-port figure. Plug in a second device and the charger redistributes. That is normal and correct — but it means a laptop charging alongside a phone is not getting 100 W.
What GaN actually changes
Gallium nitride replaces silicon in the charger’s switching components. It handles higher voltages at higher frequencies with less waste heat, which lets the same power output fit in a much smaller casing.
That is the entire benefit and it is a real one: at 43 x 28 x 69 mm this is roughly the size of the 30 W brick that used to ship with a phone, doing three times the work. It is not a performance feature — a GaN charger and a silicon charger at the same wattage charge your laptop identically. It is a size and heat feature.
The specification
| Specification | Anker Prime 100W |
|---|---|
| Total output | 100 W |
| Ports | 2 x USB-C, 1 x USB-A |
| Single USB-C port | Up to 100 W |
| USB-A port | Up to 22.5 W |
| Technology | GaN |
| Safety | ActiveShield 2.0 temperature monitoring |
| Dimensions | Approx. 43 x 28 x 69 mm |
| Weight | Approx. 170 g |
| Prongs | Foldable |
How the 100 W actually splits
This is the part worth reading before you buy, because it determines whether the charger suits your devices.
One USB-C device: full 100 W. A 14-inch laptop charges at its maximum rate.
Two USB-C devices: the charger negotiates a split. The exact division depends on what each device requests, but neither gets 100 W.
Anything on USB-A: that port tops out at 22.5 W regardless. It is there for cables and accessories that never moved to USB-C, not for fast-charging a modern phone.
PPS, and why it matters for Android
Programmable Power Supply is an extension to USB Power Delivery that lets a charger adjust voltage in small increments rather than in fixed steps. Samsung and Google phones use it for their fastest charging modes.
Without PPS, a modern Android phone still charges — just at a slower fallback rate. If you carry a Galaxy or a Pixel and the charging speed matters to you, PPS support is a specification worth confirming for any charger you are considering.
The safety feature nobody reads about
Anker’s ActiveShield 2.0 monitors temperature continuously — the company’s figure is three million times a day — and adjusts output if it detects a problem.
That sounds like marketing, and partly it is. But high-wattage chargers do get warm, and cheap ones from unknown brands are where charger failures come from. Buying a GaN charger at 100 W from a brand with a published safety system and a warranty is the sensible version of this purchase, and it is not the place to save money.
Strengths and compromises
What it does well
- Full 100 W available on a single USB-C port
- Genuinely small for the output — GaN doing its job
- Foldable prongs, so it survives a bag
- Three ports, replacing two or three separate bricks
- Published temperature-monitoring safety system
- Around 170 g
What to think about first
- 100 W is shared, not per port
- USB-A caps at 22.5 W — fine for a phone, not for a laptop
- Not enough for a 16-inch laptop plus fast phone charging
- Costs considerably more than a basic 65 W charger
- No cable in the box on some bundles — check
Do you actually need 100 W?
Worth asking honestly, because the tier below costs noticeably less.
| If you charge | You need |
|---|---|
| Phone and tablet only | 30–45 W |
| 13in laptop, or 14in at moderate load | 65 W |
| 14in laptop at full speed, plus a phone | 100 W |
| 16in laptop at full speed, plus a phone | 140 W or more |
The figure on your laptop’s own adapter is the honest guide. A machine that ships with a 65 W brick gains nothing from a 100 W charger beyond headroom for a second device.
Who should buy it
Good fit
- You travel and want one plug instead of three
- You charge a 13 or 14-inch laptop plus a phone
- You want a brand with a real safety system and warranty
- Desk or bag space is tight
Look elsewhere
- You have a 16-inch laptop and want full speed alongside a phone — go higher
- You only charge a phone — a 30 W charger is plenty
- You need several fast USB-A devices
- A dock already powers your laptop at the desk
What we could not assess
We have not measured output under load, tested how the charger splits power between specific devices, or monitored temperature over time. Every figure above is Anker’s published specification, including the ActiveShield monitoring claim, which is the manufacturer’s own figure rather than an independent measurement.
Frequently asked questions
Does each port give 100 W?
No. 100 W is the total across all ports. Either USB-C port can deliver the full 100 W when it is the only device connected; plug in a second and the charger splits the budget between them.
Will it charge a 16-inch MacBook Pro?
Yes, but more slowly than its own higher-wattage adapter, and considerably more slowly if something else is plugged in at the same time. For a 16-inch machine, look at 140 W.
What does GaN actually do?
It allows the same power output in a much smaller, cooler casing. It does not charge your devices any faster than a silicon charger of the same wattage — the benefit is size and heat, not speed.
Is the USB-A port fast?
Not compared with the USB-C ports. It tops out at 22.5 W, which is enough to charge a phone at a decent rate and fine for accessories, but nowhere near enough for a laptop. Use a USB-C port if charging speed matters.
Do I need PPS?
Only if you have a Samsung Galaxy or Google Pixel and want their fastest charging modes. Without it those phones still charge, just at a slower fallback rate.
Is a cheap unbranded 100 W charger fine?
This is the wrong place to economise. High-wattage chargers run warm and failures come overwhelmingly from unknown brands without published safety systems or meaningful warranties.
- Anker 737 power bank — 140 W, for charging away from a socket
- CalDigit TS4 — 98 W to the laptop at a fixed desk
- OWC Thunderbolt Dock
- Anker 7-in-1 USB-C hub
- MacBook Air M5 — the kind of laptop this suits
Sources. Output, port configuration, dimensions and safety specifications are Anker’s own published figures for the Prime 100W 3-port GaN charger. We have not tested this product ourselves and do not claim to have. Primary source: Anker’s Prime Charger (100W, 3 Ports, GaN) product page.
Alternative: the UGREEN Nexode 100W makes the same total-versus-per-port trade with four ports.