Comment by gregglain

From Apple:

"Apple Watch Series 12 continues to offer up to 24 hours of everyday battery life and now offers up to 10 hours of battery life during an outdoor workout — 25 percent more than the previous model.

Apple Watch Series 12 also offers faster charging: Just 15 minutes now gets up to 12 hours of additional battery life — 50 percent more than the previous model — so users can quickly recharge while getting ready for the day or before bed."