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On my charger, the 140W adapter for MacBook Pro 16 inch made in 2021, the label is so small and faint as to be unreadable. This Support page
Identify your Mac power adapter - Apple Support
lists wattage only.
Is there another page that lists the key specs for each charger: volts and amps?
MacBook Pro Apple Silicon
If you are thinking of charging a USB-C or MagSafe Mac just by providing the appropriate Voltage, forgetaboutit.
Simply asserting a charging voltage against one of the interface(s) will NOT successfully charge your MacBook Pro. The Voltage and Current are delivered only after your Mac requests and the charger agrees to supply power under certain controlled conditions. The computer is in control of the entire process.
An external power supply that provides "USB Power Delivery" (like certain displays) must negotiate over the USB cable using USB Power Delivery Protocol, and can not 'force itself' on your Mac.
If you are thinking of charging a USB-C or MagSafe Mac just by providing the appropriate Voltage, forgetaboutit.
Simply asserting a charging voltage against one of the interface(s) will NOT successfully charge your MacBook Pro. The Voltage and Current are delivered only after your Mac requests and the charger agrees to supply power under certain controlled conditions. The computer is in control of the entire process.
An external power supply that provides "USB Power Delivery" (like certain displays) must negotiate over the USB cable using USB Power Delivery Protocol, and can not 'force itself' on your Mac.
Cortland1208 wrote:
On my charger, the 140W adapter for MacBook Pro 16 inch made in 2021, the label is so small and faint as to be unreadable. This Support page
Identify your Mac power adapter - Apple Support
lists wattage only.
Is there another page that lists the key specs for each charger: volts and amps?
Check on line for "Tech Specs" for you specifc Mac..
example: MacBook Pro 14- and 16-inch - Tech Specs - Apple
MacBook charger specs: volts and amps?
