MacOS "Batteries" widget does not show Apple Watch

The battery widget only shows devices that are connected by Bluetooth. You can see this when you go to the screen for adding widgets. It says, "View the status of your Mac and connected Bluetooth accessories." As your Watch is not connected by BT to your Mac, it's not going to show there.

satcomer wrote:

Then send a feedback at Feedback - macOS - Apple and be cordial about the app malfunctioning!

Sorry my friend, but not a malfunction but rather Not Designed by Apple to Function on macOS

Refer to an older question related to iWatch Battery in Sonoma Battery Widget

Apple Watch in battery widget Macbook Pro - Apple Community

I have an Apple iWatch Series 9 ( iOS 10.5 ) that is able to Unlock my M2 Machine with Sonoma 14.5 it the two are near.

Have Tested adding the iWatch to the Widget - not go

I can not testify that this is by an Apple Design or not

Though, the iWatch Battery does show up on my iPhone 15 Pro with iOS 17.5.1

You could Start now and open an Apple Support Ticket as they are PAID  Apple Employees to deal will these types of issues . 

Or use the  Product Feedback - and make it known to Apple regarding this ongoing issue 

Then send a feedback at Feedback - macOS - Apple and be cordial about the app malfunctioning!

iUseApple247 wrote:

Hey PRP_53,

While I appreciate your suggestion, I did already see that older question and its responses. There is still no solution to this issue. It says: “Looks like no one’s replied in a while. To start the conversation again, simply ask a new question” — so that’s just what I did :)

This issue remains open and unresolved.

You are correct in that the Header reads as you have mentioned

Though, if one takes a look at the 13 Posting beneath the Header

To help expedite this matter, have included 2 screen shot I sense are relevant to your question

Nothing could be more clear, concise and straight forwards that the explanation from @ IdrisSeabright

Nor would the iPhone be connected to the computer via Bluetooth

One can use ;

Use Continuity to work across Apple devices

Pick up where you left off with Handoff on Mac