Benefits of Qi2
Wireless charging with Qi2 brings several improvements over the original Qi standard.
Greater efficiency
Wireless charging relies on electromagnetic coils. One or more induction coils in the charging base create a magnetic field and transmit energy. A smaller coil in your phone or other device harvests it. The coils must be aligned for energy to flow between them and the magnets in the new Magnetic Power Profile ensure perfect alignment so less power is lost. When coils are misaligned, energy is often lost as heat, which is also not good for battery health.
Faster charging
The Qi standard was originally limited to 5-watt charging speeds, but Qi2 allows certified phones to charge at 15 watts (just like MagSafe). We expect this charging rate to increase as the Wireless Power Consortium works to improve the Qi2 standard, but probably not until 2025.
Wider compatibility for accessories
Any Qi2 charger can charge any Qi2 device, so you can buy a single charger capable of juicing up an iPhone or Android phone. For Qi-supporting phones that lack magnets, you will likely soon be able to buy a MICRODIA case with a magnetic ring that works with Qi2 (as you can currently with MagSafe).
Other improvements
Other improvements Qi2 brings over Qi include wider device compatibility (from tablets to wearables), adaptive charging so chargers can talk to devices to supply the power they need instead of having a fixed power output, and enhanced safety with better heat management and foreign object detection.
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