Error message: For full performance, connect a higher capacity power adapter.

[Anitasw]

Which replacement higher-capacity power adapter should I buy?

[Prométhée]

Hello
we are here in the desktop section.
Obviously, this post is for a laptop?
So what is the model of the latter, how when does this message occur?
Have you replaced the charger, or is it with the original one?
Still guaranteed?

Hello

this is a recorded response (macro))
we need the exact model of your computer, and the product number
To find it follow this
for a desktop computer

HP Desktop PCs - How Do I Find My Model Number or Product Number? | HP® Customer Support

and for a laptop:

HP Notebook PCs - How Do I Find My Product Name or Number? | HP® Customer Support

[Anitasw]

@Promethee - Thank you.

The Spectre Notebook model no :13-ac013dx     ProdID  Z4Z20UA#ABA

HP Charger  TPN-LA06  model#: 918338-001  HP Spare: 860210-850

The error message pops up when I use the notebook plugged in.  

It is the original charger and is no longer guaranteed.

[Prométhée]

In this case it may be damaged!
unless this is a problem after a windows update ..
Difficult to say / confirm (unless you reinstall the computer in a previous version of windows)
If you need the adapter, you can search with the part number, directly with HP partners, or with a search engine

860210-850   Part is not orderable in the HP Parts Store.
AC power adapter (45W, wall mount) - 3-wire, with USB type-C connector, nPFC

https://parts.hp.com/hpparts/Default.aspx?mscssid=4EAAA52E0B904D0ABAE5167AA36570A0