Question about ASUS 0a001-00045900

Just to clarify about current, voltage and power.
The supply of current is determined by the notebook. The input electronics check whether the voltage (volts) offered is suitable, then it switches to supply. The power supply unit, in turn, has a maximum delivery value (amperes). If less is demanded than the power supply unit could deliver, nothing happens. If, however, the notebook wants to draw more current (amperes) than the charger can supply, then simply no more is supplied and charging slows down. Nothing happens either.

The good chargers have a monitoring of the maximum power and these also lock. Cheap junk from, you know where, may not have this and then you may just torch whatever.

You can imagine it like a water pipe. The pipe always has the same pressure at the inlet (volts). If the pipe has a small diameter (amperes), there is simply little at the other end (watts). But if you have a real pipeline, then a lot of water arrives at the other end. So in summer, you'd rather fill your pool with a fire hose than a garden hose.

Volt times ampere becomes watt .... So 19V times a maximum of 2.37A gives the desired 45W output of the power supply.
With the newer standards for chargers via USB-C, the two parties involved talk to each other. The notebook or smartphone first requires a lot of power for fast charging, then it is reduced for the remaining charge and again less for maintenance. This is important because the electronics have to be made smaller and more compact and tricks such as frequency change and pulse shaping are used here, but this is definitely too complicated ...............

Here is what I found: https://www.power-adapter-store.com/power_adap...
Power adapter for Asus Zenbook UX305C
Product Code: ASUS 19V 2.37A/3.42A 45W/65W 4.0*1.35mm

According to this, the laptop can handle both 45W/65W, or the power adapter adjusts.

Hi, I'm not sure, but for the ASUS UX306UA-FB104T it fits and charges well.
For your model you need to know if the 65W or the 45W is the right one. I hope the old one has the specification printed somewhere.