Input amps/volts don't matter in the slightest. Only thing that matters is the output and with laptop chargers, if the voltage is correct you can ostensibly move up to as much as 1.5x the amperage and not run into issues.

Does amperage matter on power adapters?

We recommend higher amperage to ensure cooler power supply and optimal charge time. If you get a charger with amperage less than your original power supply, you risk overheating your charger, burning it and in many case your device will stop functioning and/or charging.

Is it OK to use higher amp adapter?

4 Answers. The amperage rating on your power supply simply means that the supply can put out up to 2 amps, so as long as the voltage matches (12 volts) you could safely use a higher amp power supply for your device.