![]() Safety-standard compliance: A charger certified by the Wireless Power Consortium has been tested in an authorized lab and found to be both safe and in compliance with the Qi standard.We just wanted to make sure none of the models performed far below average speeds. So although we tested for charging speed, the difference in results wasn’t particularly important. Wireless charging speed: Our tests have shown that a charger’s output level has little impact on how quickly most phones charge-that is, you don’t get a much faster charge from a higher-wattage charger.We also preferred power banks with USB-C ports that supported both power in and power out some can work only to charge the power bank itself, not your phone. Most power banks in our test group offered at least one USB-A–out port, but we valued those models with faster output (including 12-watt charging and Quick Charge 3.0) more highly than those limited to 5- or 10-watt charging. Ports: More ports is better, but we also considered the kinds of ports and their capabilities.This is especially true when it comes at a good price. Capacity and value: Although we weren’t looking for the absolute largest-capacity power bank, more power is always better.The thin coils inside the charger and phone transmit and receive power, respectively, when you place them next to each other, and if they’re misaligned, the connection may break and prevent your phone from charging. Design: We considered not only how well the power bank was built, how it looked, and how big it was (all things being equal, we prefer smaller, more compact chargers), but also how effectively its surface or magnets held a phone in place.That’s the only functional difference, and we recommend a number of accessories that don’t have Apple’s endorsement but are still great options. Our testing shows that MagSafe is faster than the fastest Qi charging, though not twice as fast. There’s a small but meaningful distinction between Apple-approved, MagSafe-branded accessories and those made by other companies that simply take advantage of the iPhone’s magnets: True MagSafe supports wireless charging speeds up to 15 watts, which is the fastest wireless charging speed that iPhones can achieve, while non-MagSafe magnetic charging accessories are limited to 7.5 watts (the same maximum speed as standard Qi chargers provide). And unlike most regular Qi wireless power banks, MagSafe power banks securely attach to the back of your phone, so you can walk around and use the phone while it’s charging. Introduced as part of the iPhone 12 lineup in late 2020, MagSafe uses hidden magnets embedded in the phone to align it with compatible wireless chargers, stands, and other accessories.
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