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Quick Summary If you want to check battery health on Android , you don't need to download a single app. Every major Android phone now hides a built-in battery health screen — you just need to know where to tap, and this guide shows you exactly where, whether you own a Samsung, a Pixel, a OnePlus, or a Xiaomi phone. Why You Should Check Battery Health on Android Regularly Your phone's battery is a chemical part that wears down over time, the same way a car tire wears down with every mile. A battery that started at 100% capacity slowly loses its ability to hold a charge, and after a couple of years it might only reach 80% of its original capacity. That means shorter screen time, random shutdowns at 20%, and a phone that feels slower than it used to (often because Battery Saver kicks in more aggressively). Checking your battery health tells you whether your phone is aging normally or whether it's time to plan for a replacement — long before you're stuck with a dead phone ...