Onn Wireless Charging: Pad

| Charging Method | Efficiency | Energy lost as heat | Time to 50% (4000mAh) | | :--- | :--- | :--- | :--- | | 20W Wired (USB-C) | 95% | 5% | ~25 min | | 5W Qi Pad | 60% | 40% | ~90 min | | 15W Qi2 Pad | 75% | 25% | ~45 min | Heat degrades lithium batteries. A phone at 40°C charges slower than at 25°C. Many pads throttle power after 10 minutes due to heat buildup. Ventilated pads (with a fan or heatsink) are superior. 5. Compatibility Matrix (2024-2025) | Device | Max Wireless Speed | Qi2 Compatible? | Notes | | :--- | :--- | :--- | :--- | | iPhone 12-14 | 7.5W (Qi) / 15W (MagSafe) | Yes (via MagSafe) | Needs Qi2 pad for 15W without Apple tax | | iPhone 15/16 | 15W (Qi2) | Yes | Fully Qi2 certified | | Samsung Galaxy S23/S24 | 10-15W (Proprietary) | No (Qi2 works at 5-10W) | Requires "Samsung Fast Charge" pad for 15W | | Google Pixel 8/9 | 12W (Qi) / 23W (Pixel Stand) | Partial | Works with Qi2 at 12W | | Older Android (S20, etc.) | 5-10W | No | Any Qi pad works, but slow |

ESR HaloLock Qi2 Car Charger ($30) – note: needs Qi2 phone for 15W. onn wireless charging pad

Samsung EP-N5200 15W Fast Charge Pad ($35) | Charging Method | Efficiency | Energy lost

Anker PowerWave 10W Pad ($15-20)