An iPhone that needs charging by the afternoon does not automatically have a defective battery. Brightness, weak mobile reception, background activity, heat and recent updates can all affect runtime. A battery check becomes useful when capacity remains low, the iPhone shuts down unexpectedly or iOS displays a service message.
This guide helps you interpret common signs, act safely and prepare for battery service. It deliberately contains no opening instructions: lithium-ion batteries must not be bent, punctured, crushed or heated.
The short answer
- Check Settings → Battery → Battery Health & Charging.
- Review app usage in Battery settings.
- Create a current backup before repair.
- If the phone is hot or swollen, stop charging and do not press it.
- Check your model in the live iPhone battery replacement price list.
Signs that the iPhone battery may be weak
| Sign | Possible meaning | Next step |
|---|---|---|
| Much shorter runtime | Ageing, intensive use or demanding apps | Compare Battery Health and app usage |
| Unexpected shutdown | The battery may no longer deliver peak power reliably | Back up and arrange diagnostics |
| Service message | iOS has detected significant battery degradation | Review replacement options |
| Screen or back lifting | Possible swollen battery | Do not press or charge; request immediate inspection |
What does maximum capacity mean—and is 80% a hard limit?
Maximum capacity is an estimate compared with the battery when new. A lower value normally means less available runtime, but apps, temperature and network quality also matter. Apple uses less than 80% as a service criterion in the AppleCare battery context. It does not mean every iPhone must be serviced at exactly 80%; symptoms, the service message and diagnosis should be considered together. See Apple’s battery service information.
A hot or swollen battery needs careful handling
If the casing bulges, the screen lifts, there is an unusual smell or the phone becomes very hot without a clear reason, stop treating it as an ordinary runtime issue. Switch it off if safe, disconnect charging, do not press the screen back and keep it away from heat and flammable material. Keep your distance and contact local emergency services if there is smoke, hissing or immediate danger.
Six checks before replacement
- Review battery use for the last 24 hours and ten days.
- Reduce unnecessary brightness and Always-On use.
- Remember that weak reception can increase consumption.
- Limit background refresh only for apps that do not need it.
- Keep iOS and apps current; allow time after an update for background tasks.
- Avoid extreme heat and cold.
What does iPhone battery replacement cost?
Price mainly depends on the model. The central battery replacement table reads current gross prices directly from the repairNstore ERP and sorts models newest first. Availability is confirmed during booking.
In store or free by mail
City pages check active ERP locations. Where a repairNstore branch is present, you can plan local drop-off. Otherwise free two-way shipping is available within Switzerland.
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Battery or screen?
A screen lifting without an impact can be a battery warning. Cracks, lines, black spots or faulty touch belong in the iPhone screen repair overview. Mixed symptoms should be diagnosed before selecting a part.
Is battery replacement right for your iPhone?
Check the model and current ERP price, then choose local drop-off or free mail-in.
Frequently asked questions
When should an iPhone battery be replaced?
When runtime and reliability are clearly reduced, the iPhone shuts down unexpectedly or iOS shows a service message, diagnostics are useful. The percentage alone is not the full decision.
How much does replacement cost?
It depends on the model. The repairNstore table reads current gross prices directly from the ERP.
What should I do with a swollen battery?
Do not press, open or charge it. Switch off if safe, keep it away from heat and arrange professional inspection immediately.