7 Clear Signs Your Phone Battery Needs Replacement

Is Your Battery Failing? Here's How to Know

Battery degradation is natural — all lithium-ion batteries lose capacity over time. But how do you know when replacement is necessary vs. just a mild inconvenience? Here are 7 definitive signs.

Sign 1: Battery Drains in Less Than 6 Hours

A healthy smartphone battery should last 8–16 hours with moderate use. If you're charging multiple times a day despite moderate usage, your battery capacity has likely dropped below 80% — the threshold where replacement is recommended.

Sign 2: Sudden Shutdowns at 20–30%

Your phone shows 25% battery then suddenly turns off? This is a classic sign of battery degradation. The battery can no longer accurately report its state of charge, causing unexpected shutdowns.

Sign 3: Phone Gets Hot While Charging

Some warmth during charging is normal. Significant heat — uncomfortable to hold — indicates battery degradation. A failing battery has higher internal resistance, generating more heat as it charges.

Sign 4: Swollen or Bulging Back

This is urgent. A swollen battery is a safety hazard — it can leak electrolyte or even catch fire. If your phone's back panel is lifting or you see a bulge, stop using it immediately and bring it to us.

Sign 5: iOS Battery Health Below 80% / Android Drains Fast

On iPhone: Settings → Battery → Battery Health. Below 80% = replacement recommended. On Android, use an app like AccuBattery to check actual vs. design capacity.

Sign 6: Apps Crash or Phone Slows Down

iPhones with degraded batteries throttle CPU performance to prevent shutdowns (Apple's controversial "battery throttling"). If your older iPhone became noticeably slower, battery replacement may restore full performance.

Sign 7: Phone Takes Hours to Charge

A healthy battery should charge to 80% in 1–2 hours with fast charging. If charging takes 4+ hours or the percentage barely moves, either your battery or charging system needs attention.

Battery Replacement at Shah Mobile Service

We replace batteries for all iPhone and Android models starting at ₹400. High-quality batteries with 6-month warranty. Service takes just 30–60 minutes. We'll also check your charging port and cable for free during battery replacement.