Update: it charges up to 54 W, apparently.

My place used to be filled with USB-C adapters, but I sold a lot of devices lately and they had to go with em. So now I'm in need of another power adapter, because I only have the 35W Dual USB-C one which came with my 15" M4 MacBook Air.

I've found a dirty cheap (~20 $ w/ extension cable + USB-C to USB-C cable) 61W Apple brick on eBay. Apple states that "fast charging" is possibile on 15" MBA only with a ≥70W power adapter; so my question is: is it possible to charge faster a M4 Air with a 61W brick or is it capped at the same wattage (35) of the dual USB-C adapter? Also, does using a C-to-MagSafe 3 cable instead of a C-to-C make any difference in charging speed? Since, in principle, 61 is more than 35, and the system can draw max 70W, a 61W brick should fast charge the Mac (cause it's way higher than 35!) but Apple says it's not.

Can you help me understand? Also, if you have a 61W and '22 or later MBA it'd be cool to check the power draw with coconutBattery or similar.

Thanks!

Edit: I really don't know why I got downvoted. I thought it could be helpful to shed some light on the ambiguous "Fast charge your MacBook" Apple's support page. Anyway, when I'll have the 61W charger I'll udate you about the real power delivery.

Hi everyone!
I recently bought a new 13" MacBook Air with the M4 chip. I also have a 2019 13" MacBook Pro, which came with a 61W charger. The new MacBook Air came with a charger that has a US plug, and I live outside the US

Since I already have the 61W charger from my old MacBook Pro, I’m thinking of using it as my primary charger for the new MacBook Air M4
Would that be safe? Can using a 61W charger long-term damage the battery or affect the laptop in any negative way?

Thanks in advance!

Apologies in advance for the possibly dumb question. I have MBP (13-in, M1, 2020). It has a 61w power adapter. The USB-C cable is completed frayed on both ends. I tried to use apple care to replace it, but they are asking for a crazy service fee! I've seen USB-C cables listed for much less than they are asking. I've read not all USB-C cables are created equal, so I'm wondering if anyone knows which USB-C cable I actually need, and how do you differentiate between them?