Hello Pcmarcia,
Thank you for reaching out to Apple Support Communities.
We were able to locate this helpful infomration"
How to maximize battery performance
“Battery life” is the amount of time a device runs before it needs to be recharged. “Battery lifespan” is the amount of time a battery lasts until it is no longer useful. One factor affecting battery life and lifespan is the mix of things you do with your device. No matter how you use it, there are ways to help extend your device’s battery lifespan. A battery’s lifespan is related to its “chemical age,” which is more than just the passage of time. It includes different factors, such as the number of charge cycles and how it was cared for. Follow these tips to maximize battery performance and help extend battery lifespan. For example, keep Apple Watch half-charged when it’s stored for the long term. Also avoid charging or leaving Apple Watch in hot environments, including direct sun exposure, for extended periods of time.
Additional details can be found here: Apple Watch Battery and Performance
If the issue persist we would recommend reaching out to Apple directly. They can take a closer look and check on available options.
You can contact them by going to Get Support
Cheers!