Magnetic wireless power banks have exploded in popularity over the past two years, and so have the pitfalls. The worst case I have seen: a bank labeled 10000mAh that, once snapped onto the phone, delivered less usable charge than a tiny brick. The problem is not the capacity number - most buyers simply never check the 'wireless output' line.
The first spec to check is wireless output power. Many banks push 22.5W or 30W through the cable port, yet the wireless coil only offers 7.5W or even 5W. Stuck on the back of your phone as a stand, it charges slower than the screen drains. The 2026 national standard tightens labeling requirements for wireless output - read that line before paying.
The second is magnetic holding force. If it cannot hold on, you bought nothing. In tests, banks below 800g of force slip off within a few steps; stable ones reach 1000g or more, with an MFM-certified magnet ring properly positioned so power does not silently drop. Cheap units often have slightly offset rings - they look attached, but wattage is quietly halved.
The third is thermal control and capacity honesty. A wireless power bank heats up while discharging; poorly controlled units soon throttle power to survive. As for capacity, prefer products with third-party cycle tests that dare to print 'rated capacity' instead of only 'battery capacity'. Watch these three lines and you will hardly ever pay the IQ tax.
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