Rapid battery drain on smartphones is often due to several common factors. First, check your screen brightness; higher brightness levels can drain the battery fast, so consider enabling adaptive brightness or reducing it manually. Background apps, especially social media or navigation apps, continuously refresh and consume battery. Go into settings to see which apps are using the most battery, and close or disable background activity for those not essential. If you're using live wallpapers or widgets, they may also be a drain on power. Software updates often include battery optimization, so make sure your operating system is up-to-date. Additionally, push notifications can increase battery usage; reducing notifications for less-used apps can help. For longer battery health, try to keep your battery level between 20% and 80%, avoiding full cycles of charge and discharge.