MacBook Pro 16 M1 Pro/Max not using the 140W charger for Rapid Charging

[brosenz]

The new MacBook Pro 16 M1 Pro/Max comes with a USB-C 140W Charger who uses PD 3.1 for rapid charging at 28V/5A. If I use an old 87W Apple Charger who will charge at PD 20V/4.3A, instead of 28V/5A, meaning slow charge, would that benefit the battery life long term?

 

[Sanpete]

That's a theory some people have. Don't know how anyone would know at this point.

 

[Lucas Curious]

I put 100 cycles on the MacBook using the 140w MagSafe charger. The battery still has 100% life. I saw a test where the M1 Max was full stressed in CPU and GPU and used 115 watts so I can only assume that the rapid charger is mainly for fast charging.