Qi2 Explained: Which Phones Charge at 25W vs 15W in 2026

Short answer: Qi2 is the Wireless Power Consortium standard that added the Magnetic Power Profile — a ring of magnets forcing the charger and phone coils into alignment. It arrived at 15W in 2023, and Qi2 25W (formally Qi v2.2.1) raised the ceiling in July 2025. Watch the label: “Qi2 Ready” puts the magnets in a case, not in the phone.

”Qi2 Ready” is not Qi2

Start here, because it is the label that costs people money. In January 2025 the Wireless Power Consortium introduced the Qi2 Ready program alongside the Qi v2.1.0 specification. It lets a phone maker skip putting magnets inside the phone and instead move them into a certified case. The WPC’s own framing is that Qi2 Ready devices deliver the Qi2 experience “when paired together in approved combinations.”

Read that as: the phone by itself does not snap to anything. Samsung’s Galaxy S25 series shipped this way — the WPC certification database lists Samsung’s Magnet Clear Case for the S25 against the Qi 2.1.0 spec at up to 15W, because the case, not the phone, carries the magnets. Samsung did the same again with the S26 series. A buyer who sees “Qi2” on a Galaxy box, buys a magnetic stand, and finds the phone slides off the ring has not been sold a broken charger. They bought half of a two-part system.

A Qi2 certified phone has the magnets built in and needs nothing else. Apple’s iPhones and Google’s Pixel 10 series work this way. Everything else — “MagSafe compatible,” “magnetic wireless charging,” “supports Qi2” — is marketing text with no test behind it. Only Qi-certified products may display the Qi or Qi2 logo, and the WPC maintains a public certified-products database you can search before you buy.

What the Magnetic Power Profile actually fixed

Qi2 arrived in 2023, was announced at CES that January, and had its real coming-out at CES 2024. The headline feature was the Magnetic Power Profile (MPP): a ring of magnets that forces the transmitter and receiver coils into alignment.

That sounds cosmetic. It is not. Wireless charging is inductive coupling between two coils, and coupling efficiency falls off sharply as those coils drift apart laterally. Every watt that fails to couple becomes heat. Before MPP, a flat pad had no way to know you had dropped the phone off-centre — it simply ran hot and slow. Magnets remove the variable, which is why faster charging and cooler charging are the same fix, not two features.

In July 2025 the WPC released Qi2 25W, formally Qi v2.2.1, raising the ceiling from 15W to 25W — the WPC describes it as nearly 70% more power, and claims 0 to 50% in 30 minutes. The higher tier leans harder on alignment, which is why the 25W products all ship with strong magnet arrays and, increasingly, active cooling fans.

Which phones negotiate what, in 2026

Two things fall out of that table. First, Google is the Android maker that actually put the magnets in — the Pixel 10 line includes a lock magnet that stops accessories sliding, and Google’s own Pixelsnap charger is $39.99, or $69.99 with a stand. Second, Samsung’s top-end 25W number is real but only reachable with alignment help you have to supply yourself.

Check Anker Prime Qi2 25W 3-in-1 on Amazon

The efficiency reality

Wireless charging is a convenience choice, not a speed choice, and the numbers say so. iFixit measured a full charge of a 12.7Wh phone battery and found a cable consumed 18.25Wh from the wall. Apple’s 15W MagSafe charger consumed 23.33Wh for the same job — 24.4% more energy. A generic non-magnetic 15W pad consumed 33.93Wh, about 104% more than the cable, and took nearly four hours.

That gap between MagSafe and the generic pad is the whole argument for Qi2 in one line: the magnets are doing real work. iFixit put the yearly waste at roughly 5.8kWh for MagSafe versus 14.48kWh for the cheap pad. Neither will show up on your electricity bill in a way you notice, but the heat will show up in your phone.

Heat is the part worth taking seriously without panicking. In the same testing the battery peaked around 30C on a cable and approached 40C on MagSafe, while the generic pad kept the battery above 40C for most of the cycle. iFixit notes that anything sustained above 30C counts as an elevated temperature that degrades a cell over time. The practical reading: a magnetic charger overnight in a cool bedroom is fine, a cheap unaligned pad in a sunlit car is the thing to avoid. Buy a charger with a fan or a metal body if it lives on a desk under load.

Products that are actually certified

Check the UGREEN MagFlow 2-in-1 Qi2 25W on UGREEN.com

The Anker MagGo foldable pad in the header image is the 15W part, not the 25W one — the same product family spans both tiers and the box art looks nearly identical. If you own an iPhone 16 or newer, pay for the 25W model; if you own an iPhone 15 or a Pixel 10, 15W is your ceiling anyway and the cheaper unit is the correct buy.

Note also that every 3-in-1 above bundles a watch puck, and you are paying for it whether or not you use it. If that slot is still empty, our roundup of the best smartwatches in 2026 is the place to decide what goes on it before you commit to a 3-in-1 over a cheaper 2-in-1.

Check Belkin UltraCharge Pro Qi2 25W on Amazon

Check ESR Qi2 25W CryoBoost station on Amazon

Japanese readers have one genuinely competitive domestic option: CIO’s SMARTCOBY SLIM II Wireless2.2, an 8,000mAh magnetic pack rated for Qi2 25W at roughly 12mm thick and 170g.

Check CIO SMARTCOBY SLIM II Wireless on Amazon Japan

When to use wireless, and when not to

Wireless wins where the friction of a cable is the actual problem: a bedside pad you drop the phone onto in the dark, a desk stand that keeps the screen visible during calls, a car mount that charges as a side effect of holding the phone. In all three the phone sits for a long time and nobody is watching a percentage climb.

A cable wins whenever you are in a hurry, whenever the phone is already hot, and whenever you are charging from a battery pack where every wasted watt-hour is one you carried yourself. If you are down to 8% and leaving in fifteen minutes, plug in.

One more thing: a Qi2 25W charger needs a power supply that can feed it. Apple specifies a 30W adapter or higher to reach 25W on the iPhone 17. A pad sold without a brick will quietly fall back to a lower tier on an old 20W adapter, and the buyer blames the pad.

Summary

Qi2 solved a real engineering problem by forcing coil alignment with magnets, and Qi2 25W raised the ceiling in July 2025. But the label layer is a mess: “Qi2 Ready” means the magnets are in a case you have to buy, “MagSafe compatible” means nothing verifiable, and only the Qi2 logo backed by the WPC database tells you a product was tested. Check whether your phone has magnets inside it, check whether your charger is certified at 15W or 25W, and treat wireless charging as the convenience it is rather than the speed it is not.

For the wall bricks that feed these pads, see our Anker vs UGREEN vs Baseus charger comparison. More buying guides are at gadget-hub.jp English.

Related guides

• UGREEN’s Charger Lineup Decoded
• UGREEN’s 26 Power Banks, Sorted by the Only Thing That…
• UGREEN MagFlow vs Anker Prime vs Belkin