Wireless chargers are very convenient, whether you’re determined to minimize cable clutter or tired of plugging in your phone every day. However, there is a hidden cost: your charger wastes electricity, costing you both money and time.
There are times when this convenience may outweigh all other factors. However, sometimes it’s better to find that USB cable. Let’s understand why wireless charging is so wasteful and why it makes more sense to go the wired route.
Why does wireless charging waste electricity?
Basic physics makes it less efficient
Wireless power for phones, headphones and smartwatches revolves around inductive charging. The technology creates an alternating current (AC) inside the charger’s coil, creating a magnetic field that sends energy to the coil inside your device. This AC electricity is converted to direct current (DC) and powers your hardware.
This process consumes electricity in several stages. You convert from AC to DC in your device and back in the charger, from AC to magnetic fluxes and back and from AC to DC again. When a wireless charger produces AC at very high frequencies (around 140 KHz), the Skin Effect reduces the effective conductive area by drawing electrons away from the coil’s copper wire. This leads to energy being wasted as heat – which is part of why your phone feels warm after a charging session.
This also assumes you have placed your device perfectly on the charger and nothing else is in between. If you haven’t, you won’t get optimal speed. Charging formats like MagSafe and Qi2 solve this by magnetically aligning your device and charger. However, even a thin case can reduce efficiency by creating more barriers for electrons.
The wireless charger draws power even when you’re not using it. Because it must always be ready to be recharged, it always consumes a small amount of energy, no matter what is going on. This shot is small (iFixit saw the middle 0.2W), but many wired chargers turn off completely when not in use.
Wireless charging is a waste of money
You can save energy and the planet
All of this wasted electricity results in significantly more energy consumption than an equivalent wired charge would require. The exact waste depends on the device, placement and format, but an ideal scenario with the Qi2 (and its MagSafe equivalent) is 12-20 percent power even before you set the charger to always-on. This volume increases by 25-40 percent for a regular Qi charger.
A typical USB-C wired charger only dissipates 5 to 10 percent of the energy it draws.
The money you waste may not be dramatic, but it can add up. iFixit notes that a 15W MagSafe or Qi2 charger uses the same amount of electricity to power a 10W LED bulb for 24 days. If you live with other people or have multiple devices, this requirement will be even higher.
So, if you want to reduce your energy bills, it’s best to stick with wired charging. It’s also kinder to the planet because you’ll be reducing the strain on the power grid.
Wireless charging takes time
Network when you’re in a hurry
Electrical waste also limits the potential charging speed. Qi2 and the latest MagSafe chargers peak at 25W. You’ll see power as high as 100W, but that often requires branded chargers with aggressive (read: noisy) cooling. As a general rule, wireless charging is slower than its wired counterpart.
Fast wired charging is easier to find. Google Pixel 10 Pro supports up to 30W wired charging with a compatible adapter, while the Samsung Galaxy S26 Ultra Supports 60W. If you want to use high-end dedicated chargers, 80W to 100W devices are common. OnePlus 15.
This inconsistency affects charging times. The Galaxy S26 Ultra will take 15 minutes to reach 50 percent power at 60W, while the Qi2 pad will take about 33 minutes. If you forget to charge the day before, it can make the difference between getting through the workday and being plugged in at lunchtime. If you rarely have a watch to charge, remove the cable.
Wireless charging is still good sometimes
That doesn’t mean you have to give up wireless charging forever. A wireless charger in your car can save valuable time when you’re running late for work, rather than freeing up a USB port for a passenger. Multi-device wireless chargers can help when you have limited cable space. If you’ve ever dropped your phone by grabbing a cord, you’ll know why wireless charging can be safer.
It’s important to remember that wireless charging is expensive and it may be worth spending a few seconds to connect. Even if wireless charging seems like a hassle at first, you can save yourself some headaches.
