I had no idea my old charger was slow-charging my phone until I learned what these numbers mean

Modern smartphones charge superfast. Long gone are the days when you had your phone hooked up for 5–6 hours on end waiting for it to fully charge. Flagship models these days, like the Samsung S26 Ultra, take less than 50 minutes to charge from 0–100%. Unfortunately, not everyone may be enjoying these fast charging speeds because they are only made possible due to newer charging protocols and high-wattage chargers.

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