For example, the output for the laptop charger above is 19.5V x 3.33A. And the formula is Wattage = Voltage x Ampere, which means the charger’s output is:
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Voltage: 19.5V
Ampere: 3.33A
Wattage: 65W (rounded up from 64.9)
Just for the sake of getting a replacement, you’ll want your output specs to be exactly the same for your original and replacement laptop charger.
But if you must know, only the output voltage needs to be the same (or not more than 1V difference from your original laptop charger).
For Ampere and Wattage, they CANNOT be lower. But you can use chargers with higher Ampere and Wattage. (Explained in the FAQ section below.)
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In summary:
Now you know how to find the right laptop charger to replace the old one, it’s time to pick the best one to fulfill your needs.
Second, check the power distribution requirements of laptops. Most of the laptops on the market have a power consumption specification between 33 and 100W, while other high-end and gaming laptops usually exceed 120W. Taking a 19V⎓4.74A laptop as an example, it is recommended to purchase an adapter with the same voltage or a voltage that does not exceed plus or minus 5%.
If the voltage is too low, it can cause the laptop to overheat or even burn and may not generate enough voltage to charge the battery, or it may take longer to charge the battery.
As for the output current, it is recommended that the output current of the adapter is greater than or equal to the rated current. Choosing an adapter with a lower current will cause the adapter to become hot and unable to charge.
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