To do this, we plugged in a variable power load and an ammeter, which allowed us to finely control the power flow. USB-A ports: We tested how much power each USB-A port can provide.USB-C ports: We used Total Phase’s USB Power Delivery Analyzer and its Data Center Software to measure and record the power rates the chargers made available to connected devices, the actual power output observed when connected, how those compared with the advertised figure, and whether there were any errors in how the charger and device talked to each other.Given two identical chargers, we’d choose the one with the certification. USB-IF certification: Although we didn’t require it, certification by the USB Implementers Forum (USB-IF) helps bolster the credentials of a charger, signaling that it’s well made and safe, and that the company behind it has invested in its own reputation.Power-to-dollar value: We considered the price of the charger relative to the total power it can deliver across its ports, ruling out models that were more expensive but didn’t offer a higher power output or extra features.We considered only chargers capable of this maximum output level. USB-A charging maxes out at 12 W (5 volts, 2.4 amps) for Apple devices and many Android phones, while some of the latter can charge faster with Qualcomm’s QuickCharge 3.0 standard. USB-A ports with 12 W or QuickCharge 3.0 output (if applicable): Many USB-C chargers also include a USB-A port for legacy devices.For our most recent update, we tested five 30 W chargers to find a smaller alternative that can still charge the MacBook Air and some Chromebooks at their highest speeds. We also tested 60 W and 87-to-100 W chargers, which are capable of charging more powerful computers faster. Anything lower than that will still charge these devices, but won’t do so at the maximum rate.
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