How to Choose a Wireless Charger: 4 Steps to Match Your Phone and Speed Needs

Qi2 and MagSafe deliver the same 15W charging speed and use the same magnetic alignment ring. Qi2 is technically an open standard based on MagSafe that any manufacturer can implement without Apple licensing requirements. For iPhone users, the practical difference is zero, Qi2 chargers charge iPhone at 15W identical to MagSafe. For Android users, Qi2 is more relevant because it provides MagSafe-equivalent speed on Android devices that support Qi2 (Google Pixel 7+, some Samsung models). MagSafe-only chargers are iPhone-specific; Qi2 chargers work on both iPhone and Qi2-compatible Android.

Wireless charging works through most phone cases up to 3mm thick. Exceptions: metal cases block the electromagnetic field entirely and prevent wireless charging. Magnetic wallet cases that add metal plates for car mounts interfere with wireless charging. Thick battery cases (above 3mm) may prevent wireless charging entirely or reduce speed. MagSafe magnetic alignment works through any non-metal case of any thickness, the magnet alignment is unaffected. Charging speed through thick cases may be slightly lower than direct-contact charging.

Wireless charging is inherently less energy-efficient than wired charging because power transmission through induction loses 20 to 30% as heat compared to direct wired transmission. Apple MagSafe delivers 15W at the charger but the phone receives approximately 12-13W after efficiency losses. A 20W USB-C wired charger delivers closer to 19W to the phone. For overnight charging, the speed difference is irrelevant, the phone reaches 100% before morning regardless. For fast top-up charging during the day, a wired USB-C cable charges faster.

Standard Qi and MagSafe wireless charging requires physical contact or near-contact, the phone must rest directly on the charging pad. The effective range is 0 to 5mm. MagSafe's magnetic alignment snaps the phone to the correct position, but the charging still requires near-contact. There is no current commercial wireless charging product for phones that operates at meaningful distances from the charger despite marketing claims. True extended-range wireless power delivery for consumer devices does not exist in 2026.