If you are wondering whether your iPhone needs a new battery — the answer is usually yes by the time you start wondering. Here are the seven signs that tell you it is time, and what to do about each.
1. Battery Health Below 80%
Open Settings → Battery → Battery Health & Charging. If “Maximum Capacity” is below 80%, performance throttling kicks in automatically (iOS slows your phone to prevent shutdowns). Apple itself recommends replacement at this point.
2. Sudden Shutdowns at 20-40%
Your iPhone shuts off even though the percentage shows charge. This is because the failing cell can’t deliver the required current under load — even though some charge remains. Often misdiagnosed as a software issue.
3. Slow Charging
If your iPhone is taking 4 hours to charge with a fast charger (and the charger works fine on other devices), it is the battery — or sometimes the charging IC.
4. “Service” Warning in Battery Settings
Apple shows a “Service” warning when battery health drops below a serviceable threshold or when the battery’s internal management chip detects a problem.
5. Phone Gets Hot, Especially While Charging
A failing cell has higher internal resistance, which generates heat. Charging cycles in a hot battery cause permanent capacity loss — fix it before the cell swells.
6. Battery Health Drops Quickly
If your battery health dropped from 92% to 84% in three months, your cell has reached its limit. Healthy cells lose 1-3% per 100 charge cycles.
7. Swelling (Critical)
If your screen is lifting, your trackpad clicks weirdly, or the rear glass is bulging — stop using the phone. A swollen lithium-ion cell can vent or, in rare cases, catch fire. Bring it in immediately.
What Replacement Costs
See our full iPhone battery replacement page for current Hyderabad prices. Typical range: ₹1,800 (iPhone 7) to ₹8,500 (iPhone 16 Pro Max).
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Frequently Asked Questions
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Visit Apple battery replacement specialists in Hyderabad for same-day Apple device repair with genuine parts and a 90-day warranty. Find our service centre on Google Maps for directions to our Dilsukhnagar workshop.