Is laptop charger polarity standardized?

Chargers are often advertised with only voltage, amps and the size of the cylindrical connector. In theory you also need to also check polarity of the pins.

I have seen many warnings of home made chargers damaging laptops when plugged in the wrong way. Given that home made chargers are relatively rare, and that I have not heard of off-the-shelf chargers damaging laptops with reversed polarity I suspect there is some attempt to keep at least a defacto standard for polarity for each connector size.

Is it worth worrying about say, a Dell laptop being damaged by having a standard HP charger with the right voltage and amperage plugged in?

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Laptop chargers are usually center positive, outside negative, including Dell and HP. See for example, .

However, there is no official standard and so it is still wise to check polarity.

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