Your iPhone is dying when it’s about 30%.
Or after a light use, it feels like a ball of fire.
Or, your favourite app refuses to open, which you downloaded excitedly.
If you are facing these issues, it means your device must be saved from a failing battery. It can cause a series of performance problems. Facing these negative experiences on a device you use daily isn’t just annoying. It slows down your life and frustrates you.
Which was one, your trusty device is like a creaky old computer that’s limping along.
The good news?
Early detection of these warning signs enables appropriate action. Learning when to change your battery or even selling your phone can save you hundreds of dollars. For those in the Las Vegas area looking to sell rather than repair, contact iPhone Buyer Las Vegas for a special offer on the value of your current device.
However, if you want to catch the symptoms, here are 5 warnings to watch out for and how to solve them.
1. Battery Health Drops Below 80%
When the capacity of your battery reaches 80%, immediate attention is needed.
This key metric is accessible through Settings > Battery > Battery Health & Charging. It shows how much charge your battery can hold.
Apple recommends battery replacement when the capacity drops to 80% threshold because it indicates significant chemical aging that affects performance.
A healthy battery maintains 85-95% capacity after one year of normal use. You can expect a decline of approximately 1% per month under optimal conditions.
What to Do Next:
- Check your battery health monthly.
- Examine your charging habits; if it drops faster by 1%
- Research third-party repair options, which can be cheaper
- When capacity reaches 80% or below, schedule a battery replacement
2. Unexpected Shutdowns
The most annoying sign of battery wear occurs when your iPhone shuts down unexpectedly.
It happens when batteries struggle to deliver the power required for demanding tasks. Such as gaming, GPS navigation, camera use, or exposure to cold weather conditions, despite the battery indicator showing 20-50% charge remaining.
This is because the cell cannot maintain the necessary voltage.
What to Do Next:
- Avoid power-intensive applications until you can arrange battery replacement
- Charge your device and observe if the battery percentage drops after a restart
- Enable Low Power Mode through Settings > Battery to reduce system demands on the failing battery
- If shutdowns occur frequently (more than once weekly), focus on immediate battery replacement to prevent data loss
3. Physical Battery Swelling
Battery swelling represents a serious safety hazard that demands immediate professional attention. It occurs when gases build up inside the battery due to chemical reactions, overcharging, physical damage, or continuous exposure to extreme temperatures.
Warning Signs of Dangerous Swelling:
- Phone case no longer fits properly or feels tight
- Screen lifting or separating from the device frame
- The device feels noticeably thicker or won’t lie flat on surfaces
What to Do Next:
- Never attempt to puncture, press, or manipulate the swollen area
- Send the device to Apple or a certified repair center for emergency service
- Avoid extreme temperature exposure (don’t refrigerate or freeze the device)
- Power down the iPhone completely and disconnect from any charging sources
- Stop using the device immediately—swollen batteries pose legitimate fire and explosion risks
4. System Slowdowns
When your iPhone’s battery cannot deliver sufficient power, IOS automatically activates Performance Management features to prevent unexpected shutdowns. This protective system reduces device performance by restricting CPU and GPU capabilities.
Recognizable Performance Management Symptoms:
- Applications launch significantly slower than normal
- Background app refresh experiences notable delays
- Reduced frame rates during gaming and smooth scrolling
- Decreased speaker volume during calls and media playback
- Automatic screen brightness reduction even in bright environments
You can verify Performance Management status by navigating to Settings > Battery > Battery Health & Charging.
What to Do Next:
- Recognize this as a protective feature designed to prevent system crashes, not a software defect
- Consider temporarily disabling Performance Management by selecting “Disable” in Battery Health settings.
- Monitor device behaviour—if shutdowns occur after disabling, the feature will automatically reactivate
- View the Performance Management activation as an indicator that battery replacement is necessary
- Schedule battery replacement to restore full performance capabilities without artificial limitations.Â
5. Excessive Heat Generation and Rapid Power Drain
A worn-out battery generates excessive heat during normal usage, charging cycles, or idle periods. This overheating can worsen battery degradation and negatively impact device performance and user safety.
Heat-Related Warning Indicators:
- Excessive heat during charging
- The device feels hot during routine usage
- The device becomes sluggish when experiencing high temperatures
- Sweet, metallic, or unusual chemical odours emanating from the device
- Rapid battery depletion (less than 4-6 hours)
What to Do Next:
- Remove protective cases immediately to improve heat dissipation
- Avoid charging in direct sunlight or excessively warm environments
- Relocate to cooler environments and cease intensive application usage
- Monitor charging behaviour closely—frequent thermal warnings indicate urgent replacement needs
- Analyze battery consumption patterns through Settings > Battery to identify power-hungry applications
