want to use usb c GAN charger PD 2.0 for laptop - need info from those in the know

My laptop has a USB C PD 2 charging capable port
Currently using a 19V/2.1A brick adapter for power supply

Query one
What specifications must i look for in the usb c pd 2 charger that i buy to charge from the laptop usb c port that will supply the above voltage and current and wattage power that will not damage anything within the laptop? will any branded 65W charger work with or without PPS?

Can i use the above continuously plugged in like i do my brick adapter in the absence of the internal battery

Query two
i have another brick adapter with a USB c pin which i use for power/charging with my lenovo yoga whose specs are output ; 20V=2 A | 15V - 3A | 9V = 2A | 5V = 2A - will this work without issues? is this same as a PD 2 usb c charger?

Thank you for any help on this. I am not very familiar with these things

So many crap ones out there. My understanding after researching for my old laptop is that the laptop will only pull in as much as it needs. I ended up having to buy 2 because the first was rubbish.

This one can charge my old Dell laptop and my new Lenovo Yoga (Fast Charging) if I am away. At the same tiime charging other devices etc. Even two laptops simultaneously.

It comes with multi Country plug requirements and an extension cable if wanted.
Short Circuit protection.
Over Voltage protection

This is brilliant for my needs.

Click image to open product page. (This is an Australian link and price)

I assume your device can be charged via USB .... (he asks, embarrassingly red-faced after buying similar without first checking ...)

First, I assume that you have verified that your laptop is capable of being charged via a USB-C port. Just because a machine has a USB-C port(s), this does not necessarily mean that the system is capable of being charged via that port.

Since your system uses a 19V AC adapter, what you are looking for is a USB-C charger capable of outputting 19V at a minimum of 2.1A or 40 Watts (19V multiplied by the current of 2.1A = 39.9 Watts).

As @antspants correctly noted, the system will only draw as much current as it needs, so getting an adapter capable of outputting more than 40W will not hurt it at all.

Think of it like your water faucet. The lake or reservoir supplying your home is likely able to deliver millions of gallons, but that doesn't mean that every time you turn your faucet on you get millions of gallons of water. The amount of water delivered is limited by the carrying capacity of the pipes. Likewise, your laptop will not draw more power than it is designed to draw.

Advantages of using a smaller wattage adapter (so long as it still meets the minimum requirements of the system): Small size for portability

Advantages of using a larger wattage adapter: If your power supply has more than one connector, you can charge both your laptop and other device(s) at the same time. Also, some laptops are notoriously cheap with their factory provided chargers. As an example, I have a laptop that came from the factory with a 65W adapter, but the user guide notes that you can charge the laptop faster using a 100W+ adapter. So it's possible that you could get faster charging with a more capable adapter, but you will still be limited in how much power you draw from that adapter.

On the same laptop that I just mentioned, I use a 120W adapter. This allows me to charge my laptop and a phone at maximum speed simultaneously and the adapter I have now is still smaller than the 65W adapter that came from the factory.

Some other notes: 19V (or 20V, consider them to be the same) is pretty much a universal for laptops. As a result, pretty much every USB charger is capable of outputting 19V. However, please be aware that if you are reading this and have a system that uses 12V rather than 19V or 20V, you need to be very careful that the USB-C charger you get actually has the capability of outputting 12V. 12V is not used as often as 19V and as a result many USB-C chargers have no provision for outputting 12V.

In summary: Make sure that the USB-C charger that you get can output the correct voltage for your system (19V for your system) and that it can output a minimum of 2.1A for a total wattage of 40W. A higher wattage output capability is perfectly fine, just be aware that chargers with the ability to output more power will be larger in size and price.

idgat said:

I assume your device can be charged via USB .... (he asks, embarrassingly red-faced after buying similar without first checking ...)

Click to expand...

Thank you for your encouraging reply idgat

No i did not BUY the other charger - i possess it because it came with my SECOND laptop. so was checking whether it would substitute/replace the brick adapter that has malfunctioned which belongs to my FIRST laptop

FYI, you can use a USB-C PD charger with laptops that DON'T support USB charging by purchasing an inexpensive PD trigger cable.

As an example, I have an old HP laptop for which the power brick died. The original brick was a 19V 100W model with a barrel jack. I was able to purchase a PD trigger cable with a 19V output with the correct barrel jack so now I can use that laptop with any USB-C PD charger that outputs 100W or more.

This actually worked so well that I purchased PD trigger cables for other laptops even where my original power brick works fine so that I can now power all of them from USB-C chargers.

More Information

USB-C PD chargers use PD (the Power Delivery protocol) to negotiate a voltage to be used. For example, when you plug a charger into your laptop, the two devices "talk" to each and negotiate the use of 19V. A PD trigger cable does this for you. It talks to the PD charger and tells it to output 19V. Note that there are PD trigger cables capable of outputting other voltages than 19V so make sure to use one that triggers 19V specifically.