Why Apple watch ultra's battery drains too fast after the latest update (10.0.1)

Hello Ahmednbh,

Thanks for using Apple Support Communities. We'd recommend starting with the guidance from Apple Watch Battery and Performance which can help isolate and resolve Apple Watch battery issues. The following section may be particularly helpful.

"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."

Take care.