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This is the safe and correct answer. This thread is being used as a dupe target, and many of the new questions are about how far can I deviate from this advice. Since this thread is, itself, closed as a duplicate, new answers can't be added here. So let me add a few thoughts to better address the new questions. Voltage: Exact is guaranteed OK. I would suggest that ~3% should generally be safe as "close enough" (+/- 0.5V at 19V or 20V output). Current: equal or greater is guaranteed OK. Less can potentially work if its close and you don't push things. (cont'd)
– fixer1234
Commented Jan 5, 2017 at 1:49
The OEM charger may be generic/over-spec'ed, and it's designed for max load and to power and charge concurrently. With a lower capacity charger, charge the battery while powered off before using it to operate plugged in, and minimize accessories that are powered from the ports. If an under-powered charger still gets hot, assume it's inadequate. One additional caveat: Some brands check for their own proprietary charger, so just a matching plug doesn't guarantee that the charger will work.
– fixer1234
Commented Jan 5, 2017 at 1:50

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