I use a tiny 15 watt charger for my laptop.

It can just about charge the laptop whilst web browsing, but if anything CPU heavy happens then the battery discharges a bit.

But over a whole workday I find the charger is enough, and I prefer a smaller lighter charger over the ability to run a game 24x7.

I have one of the first Thinkpads to have a USB-c socket, and the PC can be recharged slowly that way using a low-wattage adapter, but then it will not draw any power at all from the charger when you turn the laptop on, you get a message informing you of this.

Install the BIOS update. after my update it charges on everything except a 5V only adapter, although it doesn't tell the OS it's charging unless it's on a 45 watt or more supply.

Thanks for this, looks like there is a BIOS update, I'll give it a try soon.

We have one a couple years older before USB-c and no more updated BIOS for that one though.

Yes. I probably could do with an even smaller charger.