electrical details of apple watch charging

Yes you are not helpful, though I understand you are trying to be. The watch has a 282mAHr battery in it. There no possible way you need Fast Charging (or a 20 watt charger) for that matter for a battery that small if you are charging it to 80 percent in 45 minutes. A 5V 1 A regular charger has plenty of juice to charge it at that rate and supply the rest of the watch power simultaneously.

You are the one who does not understand what USB C quick charge brick is. It simply puts out a voltage at max current of 3A for USB C connector or 2A for a USB A connector. Through the PD protocol the device being charged commands the brick to the appropriate voltage to boost the charging power watts. But none of this is required for the watch since the base default USB voltage of 5V is plenty sufficient to charge its 282mAHr battery to 80 percent in 45 minutes with way less than the maximum current available with the USB C connector.

Apple is calling out specs that clearly say it only requires exactly what I described here which is a 5V 1 A charger. Why they call out PD is one question which you cannot answer and for which I have no idea. It's simply not required. Unless they are using the lack of PD protocol to disqualify old chargers from working. But that would be pretty disingenuous so I doubt they would do that just to be mean to customers. The other item which is not present on the Apple web site is how do regular charging not fast charging. Funny why there is no information on this. USB charging is supposed to be backwards compatible within the limitations of the source (charging brick) having enough current capability to support the battery charging and simultaneous operation of the device.

This really looks like a marketing mess by apple...stop shipping chargers, then only supply enough information on the chargers so that people are forced to purchase new and more expensive chargers. You're advice is terrible since you don't know what you are really talking about and only are trying to amplify apples voice of 'buy something you don't really need because we say it will work and makes us look like we're giving you a leading edge feature of fast charging'. But the reality is that the minimum requirements are being withheld by apple to make them look good, and you are not providing them because you have no idea. I'll bet you dont even own an apple watch nor have you ever plugged it into a 5V 1A non PD charger.

The web site you pointed clearly states a 5W charger will fast charge and that a standard magnetic charger will work. Here's the text excerpt from the web site address you pointed me to:

"Fast charging requires an Apple USB-C Magnetic Fast Charging Cable. This cable has aluminum around the magnetic charger and a USB-C connector.

You also need one of these power adapters:

• Apple 18W, 20W, 29W, 30W, 61W, 87W, or 96W USB-C Power Adapter
• A comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD) of 5W or greater"

Are you disputing the Apple web site data, or did you just not read it, or are you just someone making comments without any knowledge?? I am questioning the web site information specifically. The web site is very clear. Is it wrong? I'm not sure I can trust you. Do you have technical credentials on electronics power management?

Yeah I don't know. It really seems to me the PD negotiates voltage not current. the default and minimum of PD is 5V so if you use a 5V 1A non-PD brick it will charge at 5V 1A. Apple seems to be calling this a Fast Charge Capable device, but I really dont think it is since Fast Charging is defined as using one of the higher charging voltages not the default 5V. I don't think you know what you are talking about. Also you didnt answer why the web site says it will work with standard apple magnetic cable. But please don't since I don't trust your advice. Please can someone from apple resolve this so we know the proper ways to charge the series 8 watch. You're customer support is not available to me since I just purchased the watch today and haven't received it in the mail yet. It's a Christmas present and I want the proper charging capability present on Christmas day. Currently you don't provide charging components, and your web site seems messed up. Thanks.