Tests indicate wireless charging is much less efficient than cord charging; Pixel 4 charging tests showed wireless charging used 47% more power than cabled
We crunched the numbers on just how inefficient wireless charging is — and the results are pretty shocking
Context & Ripple Effects
When Google launched the Pixel 4 it opened fast wireless charging to any Qi pad, dropping the Pixel 3's requirement for its own Pixel Stand and making wireless charging a default selling point across the lineup. Since then, the wireless track has been defined by ecosystem friction — Apple's MagSafe underwhelmed through its first year — while vendors like Xiaomi chase headline speeds with a 120W wireless HyperCharge demo.
OneZero's tests inject the missing variable into that race: cost. A 47% power penalty on the Pixel 4 means every convenience claim about Qi charging carries a measurable energy bill that none of the marketing around these launches accounted for.
First-order effects
- Pixel 4 owners who charge wirelessly pay roughly half again more in electricity for each full charge than they would over USB-C — a direct, recurring cost of choosing the Qi pad Google made universal on this phone.
- Reviewers and buyers now have hard efficiency numbers to weigh against the any-Qi-charger flexibility Google advertised at launch.
Second-order effects
- Vendors pushing wireless speed records amplify the penalty: Xiaomi's 120W wireless demo implies far larger absolute losses per session than the Pixel 4's test showed, so the faster the wireless race runs, the more the efficiency gap widens.
- Apple's MagSafe positioning takes a second hit — already criticized for a limited ecosystem, it now competes against wired charging on energy cost as well as convenience.
Third-order effects
- If the pattern holds, charger efficiency becomes a spec reviewers and regulators treat as seriously as charge times, forcing wireless standards bodies to treat lost watts as a design constraint rather than an accepted trade-off.
- The likely structural outcome is a two-tier market: wired charging as the efficiency and speed benchmark, wireless sold explicitly as a paid convenience premium — with battery longevity and grid impact becoming part of the purchase calculus.
The trend: Smartphone charging is splitting into two tracks — wired charging competing on speed-and-efficiency records while wireless competes on convenience ecosystems — and independent efficiency testing is starting to price that convenience.