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Charger Wattage & Protocol Matcher — how many watts does your device need?

Quick answer

Can a 20W PD charger fast-charge your Galaxy S23?

  • Which GaN brick covers a laptop + phone?
  • Pick your exact device to get the minimum watts and protocol

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How the charger matcher works

Verdict = your charger (watts + PPS support) vs your device’s max charging speed: full when both the watts and the protocol match, limited when either falls short.

The most common question before buying a charger on AliExpress: “will this charger fast-charge my phone?” The answer depends on two numbers most buyers never check: the charger’s wattage and the charging protocol the phone supports. Samsung and Pixel phones need PD 3.0 PPS for their top speed (a plain PD charger without PPS drops to about 15W); Xiaomi, OnePlus and Infinix use proprietary protocols (HyperCharge / SUPERVOOC) that no third-party charger ever reaches, so they charge at standard PD speed only; iPhones are happy with plain PD. We built a hand-curated database from public spec sheets: each device’s max watts on a third-party charger, a “needs PPS” flag and its battery capacity. The instant verdict on your own charger runs entirely in your browser with no API call; the optional charger search makes one call to the AliExpress engine and parses the advertised wattage out of each result title, ranking them: enough watts, works but slower, too weak, or no wattage stated (check the photos).

  1. 1

    Step 1: pick your exact device

    Type your phone or laptop (e.g. Galaxy S23 or MacBook Air M2) and choose it from the suggestions — you instantly see its max third-party charging speed, required protocol and estimated battery capacity.

  2. 2

    Step 2: test the charger you own (optional)

    Enter the watts printed on your charger and whether it mentions PPS — you get an instant in-browser verdict: full speed, fast but limited, missing protocol, or slow, plus an estimated 0→80% time.

  3. 3

    Step 3: search for a matching charger

    One click searches AliExpress with the wattage/protocol keywords suited to your device and ranks results by the wattage stated in the title — listings with no stated wattage get the “check the photos” tag instead of a guess.

FAQs

Will a charger with more watts than my phone needs damage it?

No — this is the single most common charging misconception. USB-PD negotiates voltage and current between charger and phone, so the phone only draws what it needs no matter the charger’s rating. A 65W charger on a 20W phone simply charges at 20W, safely. The reverse is the real annoyance: a weaker charger means slower (still safe) charging.

Why doesn’t my Samsung fast-charge from a powerful PD charger?

Samsung (and Pixel) phones reach “Super Fast Charging” specifically over the PD 3.0 PPS protocol. A charger that supports PD but not PPS — even a 65W one — drops the phone to about 15W. That’s why we search Samsung and Pixel devices with PPS keywords and rank titles that mention PPS higher.

My phone supports 120W charging but the tool says 18W max on third-party chargers — why?

Xiaomi, Redmi, POCO, OnePlus and Infinix use proprietary charging protocols (HyperCharge, SUPERVOOC and similar) that only work with their own or licensed chargers. Third-party chargers on AliExpress charge these phones at standard USB-PD speed (usually around 18W) no matter the number printed on the box. We show this warning explicitly instead of misleading you with the marketing number.

Which charger covers a laptop and a phone together?

Rule of thumb: buy a charger that covers your largest device (usually the laptop — 65W is typical for MacBook Air and most Windows laptops). Most multi-port GaN chargers give the first port the largest wattage share, so you can run the laptop alone or the laptop plus a phone at a slower shared rate. You don’t need the sum of both devices’ watts — just the laptop’s.

Where do the wattage and protocol numbers come from?

From a hand-curated database compiled from public spec sheets for the models most common in our audience; the values are approximate, not lab measurements — and we say so everywhere. Result tiers come from parsing the wattage out of listing titles only: listings that state no wattage get no guessed number, just a “check the photos” prompt.

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