Have you gotten used to your iPhone lagging and accepted it as part of daily life? Do you find yourself restarting it after every crash? Do you miss the days when apps loaded instantly, and you could watch videos until the battery hit 5%? If so, it might be time to take a closer look at your battery’s health.

1. The battery is swollen

If your battery has expanded and is pressing against the phone’s frame, there’s no question—it needs immediate replacement. Signs include a hazy-looking screen, a slight gap between the screen and the phone body, or a “squishy” feel when you press the edges of the display.

2. Unexpected shutdowns

Does your iPhone suddenly shut down even though it still shows plenty of charge left? This often means the battery can no longer handle the load. A recalibration may help, but if the issue continues, replacement is the only real fix.

3. Sluggish performance on newer models (iPhone 6 and later)

If your iPhone feels slow—especially on iOS 11.3 or newer—it may be throttled due to battery wear. You can check this by going to Settings → Battery → Battery Health & Charging. If the maximum capacity is around 80% or lower, the battery has lost a significant portion of its power and should be replaced.

4. Short battery life on older models

For iPhone 5s or earlier, the main warning sign is short usage time. If you find yourself needing to recharge every 1–2 hours, the battery is worn out and needs to be replaced.

5. iPhone only works when plugged in

If the phone powers on only when connected to a charger, the battery is either completely dead or has a connection issue. In both cases, it requires technical attention.

6. Overheating

All batteries produce some heat while charging, but if your iPhone feels hot to the touch often (without being in direct sunlight or extreme heat), it may be a sign that the battery is failing.

Conclusion

Batteries, like all consumables, have a limited lifespan. As they age, their performance decreases, leading to more problems over time. If you’ve noticed any of these signs, it’s probably time for a replacement. A new battery can bring your iPhone back to life and improve your everyday experience.