This is not accurate information. The Series 8 is rated for 18 hours just like every Apple Watch before it and the Ultra is rated for 36. In the new low power mode, only then does the series 8 get 36 hours while the ultra goes to 60 hours for the Ultra. Please make sure you guys are putting accurate information on your site. I've counted on it for years and was shocked to see such an ignorant mistake.
Apple has made some pretty powerful claims for the battery life of its new Watch Ultra, as indeed it has for the Series 8. Now, actual independent measurements for these wearables have emerged. They show that the Ultra may indeed have a significantly larger battery compared to its more traditional counterpart, although whether that really translates to longer screen-on times remains to be seen.