Review · Charging · 1 model
Anker 100W 3-Port charger (B121B) review: 100 watts to one port, a screen you stop reading, a cable you need
A 100-watt GaN charger with two USB-C ports and a USB-A, folding prongs, a 5 A cable in the box and a display that shows what each port is drawing. It replaces a 16-inch MacBook Pro's brick and a phone charger with one 7.5 oz cube. This review is about what the display is for, what the cable is for, and what the laptop gets when the phone is plugged in beside it.
Verdict
What it is
the charger reviewed
Anker 100W 3-Port Charger with Smart Display (B121B)
- Max output
- 100 W
- Ports
- 2 USB-C, 1 USB-A
- Weight
- 7.5 oz
Check price on Amazon
A GaN charger giving up to 100 W from either USB-C port and up to 33 W from the USB-A, with folding prongs, a small display showing power and temperature per port, 2.2 by 1.3 by 2.7 inches, 7.5 oz, and a USB-C cable in the box, all from Anker’s page.
Strengths
- 100 W to a single USB-C port
- The display tells you what the laptop is actually drawing
- Cable included
Limitations
- 7.5 oz — twice the 65 W chargers
- The display is a party trick after the first week
- Splits down when three devices share
Good for
- a 15–16 in laptop plus a phone
- one charger for everything on a trip
- anyone curious about real charging rates
Look elsewhere if
- a phone-only user
- a slim travel kit
The 100 watts
A 16-inch MacBook Pro ships with a 140 W brick and runs and charges on 100; a 14-inch Pro ships with 70 or 96; a 90–100 W Windows laptop is the same case. For any of those, this charger replaces the brick. For a 65 W laptop it changes nothing: the laptop takes 65 and the extra 35 sits unused, in a cube that weighs more.
The split
Two devices divide the budget. Anker states the per-port maximums and that the total is shared; it does not print a table for every combination on the page we read. The working assumption is a phone at 20 W and the laptop at the remainder, around 80, which keeps a 16-inch laptop charging under load. With three devices the laptop loses more. The display shows the real numbers, which is more than any charger without one can say.
The display
Power and temperature per port, on a small screen on the front. For the first week it answers the question these chargers raise — is the laptop actually getting 100 W, or did the cable cap it at 60? — and after that it is a light behind a desk. We would not pay for it and would not avoid the charger for it.
The cable
A hundred watts needs a 5 A cable with an e-marker, and Anker includes one. Use another cable and the charger quietly delivers 60 W; the display will show it, which is the second useful thing the display does.
Weight
Seven and a half ounces: twice the UGREEN 65 W, three-quarters of the Anker 140 W. In a bag it is a phone’s worth; on a loose outlet it leans.
Strengths
- 100 W to a single USB-C port
- The display tells you what the laptop is actually drawing
- Cable included
Limitations
- 7.5 oz — twice the 65 W chargers
- The display is a party trick after the first week
- Splits down when three devices share
Good for
- a 15–16 in laptop plus a phone
- one charger for everything on a trip
- anyone curious about real charging rates
Look elsewhere if
- a phone-only user
- a slim travel kit
Who should buy it
A 15 or 16 inch laptop, or a 90–100 W Windows laptop, plus a phone, in one bag. Anyone who wants to see what the laptop is drawing before trusting a charger.
Who should not
A 13-inch laptop — the UGREEN Nexode 65 W at 4.6 oz. Two laptops at once — the Anker 140 W four-port. A Samsung owner who needs PPS stated — the Belkin 65 W Dual.
Sources
Facts checked October 10, 2026
- Anker — Charger (100W, 3 Ports, Smart Display) product page — Manufacturer documentation, checked October 10, 2026
- Amazon listing (Anker) — Retailer listing, checked October 10, 2026
What does each port get with two devices?
Anker states the per-port maximums — 100 W on either USB-C, 33 W on USB-A — and says the total divides when ports share. For a laptop and a phone, assume the phone takes about 20 W and the laptop gets around 80. The display shows the real figure, which is its one lasting use.
Do I need the included cable?
For the full 100 W, yes: it must be a 5 A cable with an e-marker, and Anker includes one. A standard cable caps the laptop at 60 W silently; the display will show it.
Is it too heavy for a wall outlet?
At 7.5 oz with the plug folded out, it stays in a firm outlet and droops in a loose one, as every 100 W GaN cube does. Behind a desk, fine; on a hotel nightstand, check.
Does it support PPS for Samsung?
Anker's page for the B121B that we read does not state PPS. If a Samsung's Super Fast Charging matters, the Belkin 65 W Dual on our shortlist states it.
Related reading
Shortlist · Charging
Best compact USB-C chargers: six from 30 to 140 watts, by what each port actually gets
The watt figure on a charger is what one port gets when nothing else is plugged in. Plug in a second device and some chargers drop to 15 W shared, some publish a split, and some leave you to find out. Six compact GaN chargers from UGREEN, Belkin and Anker, 30 to 140 W, compared on total output, the published split, ports, size and weight from the makers.
Guide · Charging
Watts, PD, PPS and cables: how to read a USB-C charger before you buy one
A USB-C charger's box says 65 W and the phone charges at 18. The reasons are all on the spec sheet if you know which lines to read: the voltage profiles, the PPS range, what the ports share, and whether the cable can carry it. This guide explains each in plain terms, with four chargers and a power bank as worked examples from the makers' own figures.
Comparison · Charging
65 W or 100 W for a laptop and a phone? UGREEN Nexode 65W vs Anker 100W 3-Port
Both chargers have two USB-C ports and a USB-A, fold their prongs and fit a jacket pocket. One gives a single port 65 W and weighs 4.6 oz; the other gives 100 W, weighs 7.5 oz and has a screen. Which one to carry depends on one fact — the laptop's own wattage — and on what happens to the laptop when the phone is plugged in beside it, which only one of the two makers says.