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Keeping in mind that Samsung s Galaxy S21, Galaxy S21 Plus, and Galaxy S21 Ultra have a peak charging speed of 25W, we tested a variety of chargers including Samsung s own 25W charger and some third-party chargers from reputable accessory makers that claim at least 25W charging speed or more. How we tested chargers for the Galaxy S21 phones To test the charging speeds for the Galaxy S21 series, we used the standard Galaxy S21 as our test unit.
Before plugging in a charger, we drained the Galaxy S21 to the point that it no longer turns on. Once drained, we plugged in a charger and kept the phone off to prevent as many variables as possible. At the moment we plugged the Galaxy S21 into the charger, we started a timer for 15 minutes. After 15 minutes had passed, we unplugged the phone, which showed us the battery charge percentage for a 15-minute charge, and recorded it. We then plugged the charger back into the Galaxy S21, and set another timer for 15 minu ....