Power reserve
Could apple please reinstate the power reserve function? I was planning to use this on a remote 7 day hike. Very annoyed.
Apple didn't really take power reserve away. They just now call it Low Power Mode. Pretty much the same feature.
On your Apple Watch - Settings > General > Battery > Turn on Low Power Mode
Honestly though, even Apple Watch Ultra, which has a 36 hour battery might not make it through a 7 day period without being charged along the way.
So perhaps a better solution for you would be to purchase a power bank you can charge up before you leave home and use it to charge your watch.
Here's a link to Amazon and I'd look at portable chargers of at least 10,000mAh --> https://www.amazon.com/s?k=wireless+battery+pack&rh=n%3A2335752011%2Cp_36%3A2491158011&dc&ds=v1%3A0H9tuYgGz5kNQytF6MN4u%2BFmQZ7WlJFEiyt%2FEjuJRag&crid=D8HHEF3HK9X0&qid=1675374564&rnid=2491154011&sprefix=wireless+battery+pack+%2Caps%2C120&ref=sr_nr_p_36_4
