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Qi (/ tʃ iː / CHEE) is an open standard for inductive charging developed by the Wireless Power Consortium.It allows compatible devices, such as smartphones, to receive power when placed on a Qi charger, which can be effective over distances up to 4 cm (1.6 in). [1]
Apple released two chargers using the MagSafe standard in 2020: the MagSafe Charger, which is a single charging pad for iPhone, and the MagSafe Duo Charger, which is a charging mat with both MagSafe and an Apple Watch charger. [2] Apple has also licensed the MagSafe standard to third parties to develop chargers and cases.
An iPhone X being charged by a wireless charger Wireless power transfer from inductive charging pad to Deutsche Telekom T Phone Pro 5G. Oral-B rechargeable toothbrushes by the Braun company have used inductive charging since the early 1990s.
The batteries are user-replaceable. Just like its predecessor, the S9 supports AirFuel Inductive (formerly PMA) and Wireless Power Consortium's Qi wireless charging standards. [19] Wired charging allows for rates up to 15 watts via Qualcomm Quick Charge 2.0, [1] while wireless charging is possible with rates up to 10 watts. [20]
Quick Charge requires both the power supply and the device being charged to support it, otherwise charging falls back to the standard USB ten watts. Quick Charge 2.0 introduced an optional feature called Dual Charge (initially called Parallel Charging), [4] using two PMICs to split the power into 2 streams to reduce phone temperature. [5]
In 2016, Belkin released an iPhone-compatible adapter for simultaneous iPhone charging and headphone use. [29] Belkin produced the world's first third-party MagSafe accessory. [30] In 2023, Belkin launched the BoostCharge Pro 3-in-1 Wireless Charging Pad with Qi2 and the BoostCharge Convertible Qi2 Wireless pad to stand.