You can check most Android phones’ battery health without downloading anything, using either a hidden dialer code or a built-in battery menu, depending on your phone’s brand. Below is the exact method for each major manufacturer, plus what the numbers actually mean.
Why you don’t need an app for this
Most battery-health apps on the Play Store simply read the same data Android already exposes through its own diagnostic menus, then wrap it in ads. Since Android 14, several manufacturers also added a proper battery health reading directly into Settings, so an app is often redundant. The methods below use only what’s already on your phone.
Samsung: use the hidden diagnostic menu
- Open the Phone app and dial *#0*#.
- This opens Samsung’s hardware test menu automatically.
- Alternatively, open the Samsung Members app (pre-installed on most Galaxy phones) and go to Get Help → Interactive Checks → Battery Status.
Samsung Members is technically an app, but it comes pre-installed on every Galaxy device, so there’s nothing to download.
Google Pixel: check via Settings
- Open Settings → Battery.
- Tap the three-dot menu in the top right and select Battery health (available on Pixel 6 and newer running Android 14+).
- You’ll see a plain percentage estimate along with the manufacture date of the battery.
OnePlus and Oppo: use the hidden engineering menu
- Dial *#808# in the Phone app.
- Select Engineer Mode, then Battery Information.
- Look for “Battery Health” or the charge cycle count if health isn’t shown directly.
Xiaomi, Redmi, and other brands without a health menu
Xiaomi, Vivo, and a handful of budget Android brands still don’t expose a battery health percentage anywhere in the system, even through hidden codes. For these, the closest built-in substitute is comparing your Settings → Battery → Battery usage screen-on time against what it was when the phone was new. A noticeably shorter screen-on time for the same charge is the practical sign of degradation, even without an exact number.
What the percentage actually means
| Battery health | What it means |
| 90–100% | Performing close to new |
| 80–89% | Normal wear for a phone 1–2 years old |
| 70–79% | Noticeable capacity loss; consider a replacement if it bothers you |
| Below 70% | Significant degradation; battery replacement is usually worth it |
FAQs
Does *#0*# work on every Samsung phone?
It works on most Galaxy A, S, and Z series phones from the last several years. A few carrier-locked models disable this menu, in which case Samsung Members is the fallback.
Is checking battery health through a hidden code safe?
Yes. These menus are read-only diagnostic screens built by the manufacturer. You cannot damage your phone just by viewing them.
Why doesn’t my phone show a battery health percentage at all?
Not every manufacturer includes this feature. If your phone doesn’t show one through the methods above, screen-on time comparison is the most reliable free alternative.
Once you have a number, see our guide on what battery health percentage actually means for daily use to work out whether it’s time to replace your phone.
