How to Check Phone Battery Health (iPhone and Android)
Quick Answer
On iPhone: Settings → Battery → Battery Health & Charging. The Maximum Capacity percentage is your battery health — below 80% means significant wear. On Android: install AccuBattery (free, Google Play), use it for 3–5 charge cycles, then check the Health tab for your battery's capacity percentage. Many Android phones also show battery status in Settings → Battery, but the detail level varies by manufacturer.
A phone battery that once got you through the day on a single charge now needs a top-up by noon — battery health is the number that explains why. Both iPhone and Android give you the data, though they approach it differently. This guide covers the exact steps for each platform and explains what the readings mean, so you can make an informed decision about whether a replacement is worth it.
How to Check Phone Battery Health on iPhone
- Open Settings.
- Tap Battery.
- Tap Battery Health & Charging.
The screen shows Maximum Capacity — the percentage of original capacity remaining. A new iPhone shows 100%. Apple considers below 80% to be significantly degraded and will show a "Service Recommended" message at that point.
On iOS 17 and later, this screen also shows your cycle count at the bottom. Apple rates iPhone batteries for 500 cycles before reaching 80% capacity.
| Maximum Capacity | Condition |
|---|---|
| 90–100% | Good to excellent |
| 80–89% | Normal wear; Apple's threshold is at 80% |
| Below 80% | Service Recommended — replace for full runtime |
How to Check Phone Battery Health on Android
Android's approach varies by manufacturer. Here are the methods in order of accuracy:
Built-In Settings (Varies by Brand)
- Google Pixel (Android 14+): Settings → Battery → Battery health
- OnePlus (OxygenOS 13+): Settings → Battery → Battery Health
- Samsung: Settings → Battery and Device Care → Diagnostics → Battery status
- Most other Android phones: No battery health % in standard settings
Hidden Diagnostic Code
Open the Phone/Dialer app and dial *#*#4636#*#*. If a diagnostic menu appears, tap Battery information to see battery health status and voltage. This works on most but not all Android phones.
AccuBattery (Recommended for All Android Phones)
- Install AccuBattery from Google Play (free).
- Follow the setup and charge to 100%.
- Use normally through 3–5 charge cycles.
- Open the Health tab — it shows estimated battery capacity vs. factory design capacity as a percentage.
AccuBattery's reading is more accurate than any single-point diagnostic code because it averages measurements across multiple real charge cycles.
Signs Your Phone Battery Needs Replacement
- Battery drains noticeably faster than when the phone was new (beyond what new apps and features account for)
- Phone shuts off unexpectedly at 10–25% remaining charge
- Battery percentage jumps erratically (from 35% to 8% instantly, or similar)
- Back of phone noticeably warm during normal browsing or calls
- Back cover or screen appears to be pushing outward slightly (battery swelling — urgent)
Phone Battery Replacement: Costs and Options
| Option | Cost (approximate) | Pros / Cons |
|---|---|---|
| Apple battery replacement (iPhone) | $99 (most models) | OEM battery, warranty; takes 1–3 hours or mail-in service |
| Samsung battery replacement | $50–$80 at Samsung Service | Official; mail-in or walk-in |
| Third-party repair shop | $40–$70 | Faster, cheaper; quality depends on battery brand used |
| Self-repair (iPhone Self-Repair) | $69 + rental | Apple-supported DIY; requires renting a repair kit |
A battery replacement typically extends the phone's useful life by 2–3 years. If the phone's hardware is otherwise performant and the screen is in good condition, battery replacement is almost always better value than a new device.
FAQs
What phone battery health percentage should I replace at?
The standard threshold is 80%. Below 80%, most manufacturers recommend service. In practice, if your phone gets through the day comfortably at 78%, replacement is not urgent. If you are charging twice a day or experiencing unexpected shutdowns, replace regardless of the exact reading.
Does replacing a phone battery make it faster?
Only on iPhones where Apple's performance management was active due to battery degradation. If Battery Health → Charging shows "Performance Management Applied," then yes, a new battery will restore full speed. On Android, battery health does not directly affect CPU performance.
Can I use third-party batteries for iPhone?
Third-party batteries work physically but iOS displays a "Unable to verify this iPhone has a genuine Apple battery" message in Settings, and some diagnostic data may not appear. Apple stores will not service an iPhone with a non-Apple battery. For warranty purposes and full functionality, use Apple's own service or an Apple Authorized Service Provider.
My phone is 1 year old and already at 85%. Is that normal?
Slightly fast but within the normal range. Average iPhone/Android batteries lose 3–7% of capacity per year under typical use. At 85% after one year, the phone is likely charging frequently (1.5+ cycles/day) or being exposed to heat during charging. Enable Optimized Charging and avoid charging in warm environments to slow further decline.
Summary
iPhone battery health is a tap away in Settings — Battery Health & Charging shows Maximum Capacity directly. Android requires either manufacturer-specific settings or the AccuBattery app, which provides the most accurate capacity reading after a few charge cycles. The universal replacement threshold is 80%; below that, runtime drops noticeably and unexpected shutdowns become more likely. Battery replacement costs $50–$100 and typically extends a phone's useful life by years.