No, battery replacement is not covered under warranty and is subject to a charge based on the model. Additionally, it's important to note that even if a watch has a 10-year battery life, it does not imply a 10-year warranty. The water resistance (WR) of a watch cannot be guaranteed indefinitely due to normal wear and tear. Therefore, it is recommended to have the watch's WR gaskets replaced periodically, preferably every 18 months.