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Charging laptop with non-original charger
How can I tell if an AC adapter is compatible with my laptop?

So the original laptop charger broke and I switched to a charger from a laptop that I no longer use. The specifications from each are:

Original Input:AC 100-240V 1.5A 50-60Hz Output: DC 19V 3.42A

Other Charger Input: AC 100-240V 1.5A 50-60Hz Output: 20V 3.25A

Yes, the polarity is the same.

Also, the wattage has a difference of .02 from what I understand. Is wattage ever important, and more specifically, a wattage difference of that size.

Feel free to ask me any other questions about the chargers and I'll answer them to the best of my ability.

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You're very close to the 5% tolerances power supplies are designed to. You may be asking the power supply for a little bit more power than it was designed to supply. Make sure it's not getting unusually hot.

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  • It's not well within 5% - it's almost within 5%. The voltage is just over 5% more (5.26%). I don't know how much higher a voltage is typically safe, but a voltage too high (at some level) would blow components. (A voltage too low would be unlikely to cause to damage (it could get a low voltage from a dead battery and would have to tolerate it), but might not work, and a higher current should work (but see Selali Adobor's answer in superuser.com/questions/393076/…)). The current is almost 5% lower, but that's unlikely to be a problem.
    – John B. Lambe
    Commented Sep 20, 2018 at 18:07

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