Schlage locks typically require four AA batteries for their keyless entry and smart lock models. These batteries provide reliable power to ensure the functionality of the locks, which include features such as keypad entry and Bluetooth connectivity, depending on the specific model. It is important to use high-quality alkaline or lithium batteries to achieve optimal performance. Users should check the battery level periodically, as a low battery may affect the lock's operation. Most Schlage locks are designed with a low battery indicator, which alerts users when it is time to replace the batteries. For further details on battery usage and maintenance specific to a particular model, it may be helpful to review the product information available on the relevant Schlage web page.