According to reports, the Pixel Watch will feature a 300 mAh battery, regardless of which version you pick up. Apparently, Google will rate the Pixel Watch for up to a day's use between charges, but recharging the Pixel Watch could take nearly 2 hours.
https://www.notebookcheck.net/Google-Pixel-Watch-to-only-match-the-battery-life-of-the-Galaxy-Watch4-and-the-Apple-Watch-Series-7-but-with-slow-charging-capabilities.623778.0.html
I really don't understand how could ANYONE find any utility in these things if they have to be charged every single day. It completely destroys usability.
My poor amazfit lasts ONLY 4 days, and even that is not enough not to be annoying.