Can a 20V 4.51A power supply be used with a computer that requires a 19V 3.42A power supply? [duplicate]
Solution 1:
Electronic equipment is typically capable of handling voltages of a nearly 20% difference. As for the current, the laptop will only draw what it needs. If the PS was lower I'd worry, as long as it's rated higher than needed by the laptop you're ok.
Solution 2:
As long as the connectors are the same size and the polarity of the connectors are the same then everything should be fine. Some generic laptop power supplies have a rated output of 19-24v so as Tom Strike says, electronic equipment can generally handle some difference - and 19/20v are pretty close.