Written by: Ali Dirmilli
Knowing how to check iPhone battery health is one of the most useful things any iPhone owner can learn — and it takes less than 2 minutes. Whether your phone has been draining faster than usual, shutting off unexpectedly, or you just want to know where things stand, Apple’s built-in Battery Health tool gives you a clear, honest picture.
The problem is that most people don’t know it exists, don’t know where to find it, or don’t understand what the numbers mean once they do. This guide walks you through exactly how to check your iPhone battery health, what every reading means, and what action to take based on what you find.
At iMobile Denver on Sheridan Blvd, battery-related issues are one of the most common reasons customers walk through our door. Most of them had no idea their battery was the problem until they checked. Let’s fix that.
Section 1: How to Check iPhone Battery Health — Step by Step {#section1}
How to check iPhone battery health is straightforward once you know where to look. Here’s the exact path:
Step 1: Unlock your iPhone and open the Settings app (the grey gear icon on your home screen).
Step 2: Scroll down and tap Battery.
Step 3: On the Battery screen, tap Battery Health & Charging.
Step 4: Look at the Maximum Capacity percentage at the top of the screen.
That’s it. The number you see is your battery’s current health. A brand new iPhone shows 100%. That number decreases over time as the battery goes through charge cycles.
What If I Don’t See Battery Health & Charging?
This feature is available on iPhone 6 and later running iOS 11.3 or later. If you have an older device that doesn’t show this menu, your iOS version may need updating — go to Settings → General → Software Update and install the latest available version. If your iPhone is too old to support iOS 11.3, the Battery Health feature isn’t available on your model.
On iPhone 15 and Later — Cycle Count Is Also Visible
Apple expanded the Battery Health information starting with iPhone 15. In addition to Maximum Capacity, you can also see your Cycle Count (the number of complete charge cycles the battery has completed) and your manufacture date. This gives you a more complete picture of how the battery has been used. To find this, go to Settings → General → About and scroll down to find battery information.
Section 2: What the Battery Health Numbers Actually Mean {#section2}
Once you know how to check iPhone battery health, the next step is understanding what you’re looking at.
Maximum Capacity — The Core Number
Maximum Capacity is expressed as a percentage of your battery’s original design capacity. A reading of 87% means your battery can currently hold 87% of the charge it could hold when the iPhone was new. The remaining 13% of capacity has been permanently lost through normal use and chemical aging.
This matters because a lower Maximum Capacity means:
- Shorter battery life between charges
- Less ability to handle processor-intensive tasks without voltage drops
- Increased risk of unexpected shutdowns, especially in cold weather or under heavy load
What Is a Normal Maximum Capacity?
According to Apple’s official battery service guidance, iPhone batteries are designed to retain up to 80% of their original capacity at 500 complete charge cycles. One complete charge cycle is 100% of the battery’s capacity used — which could happen over one day or across several partial charges.
In practical terms, at roughly 1.5–2 years of normal daily use, most iPhones reach the 500-cycle mark and are typically sitting between 80–88% capacity. Whether that’s “good enough” depends on how heavily you use the phone and how much range you need in a day.
The Optimized Battery Charging Setting
Just below Maximum Capacity, you’ll see an Optimized Battery Charging toggle. When this is turned on, iOS learns your daily charging patterns and holds the charge at 80% until it predicts you’ll need the phone fully charged — typically right before you normally unplug it in the morning. This is worth keeping enabled. According to Apple’s own guidance, keeping a lithium-ion battery at 100% charge for extended periods accelerates degradation. Optimized charging is one of the simplest things you can do to slow the decline of your battery health over time.
Section 3: 5 Battery Health Readings and What to Do About Each {#section3}
Now that you know how to check iPhone battery health and what the numbers mean, here’s a practical breakdown of what to do at each level.
100% – 90%: Excellent
Your battery is in great shape. Normal daily charging is fine. Enable Optimized Battery Charging and avoid leaving the phone at 100% plugged in overnight if possible. No action needed.
89% – 80%: Good, But Worth Monitoring
Your battery has experienced some degradation but is still within Apple’s normal service range. You may start noticing slightly shorter battery life compared to when the phone was new. Keep an eye on it. If you’re using the phone heavily and range is becoming an issue, a replacement at this stage is perfectly reasonable and will restore performance significantly.
79% – 70%: Declining — Replacement Recommended
Below 80% is Apple’s own threshold for recommending battery service. At this level, iOS may begin throttling your processor’s peak performance to prevent unexpected shutdowns — which is why iPhones often feel noticeably slower before a battery replacement, not after. You’ll likely see a service recommendation message directly in the Battery Health screen. This is a good time to bring your iPhone to iMobile Denver for a replacement.
69% – 60%: Significantly Degraded
At this level, your phone is running on well under two-thirds of its original battery capacity. Daily charging range is severely reduced, unexpected shutdowns are common, and the phone may struggle to handle peak loads. Replacement is no longer optional for comfortable daily use.
Below 60%: Replace Immediately
A battery below 60% capacity is effectively worn out. The phone will behave unpredictably — shutting off at high percentages, draining extremely fast, refusing to charge past certain levels, or only working while plugged in. This level of degradation can also start putting stress on other components. Replacement should happen as soon as possible.
Section 4: How to Make Your iPhone Battery Last Longer {#section4}
Once you know how to check iPhone battery health, you’ll want to slow the decline going forward. Here are the most effective habits backed by battery chemistry research.
Keep Charging Between 20% and 80%
This is the single most impactful thing you can do. Lithium-ion batteries degrade fastest at the extremes — charging from 0% to 100% stresses the chemistry more than staying in the middle range. If you can’t always avoid full charges, at least avoid letting the battery hit 0% regularly.
Don’t Charge in Extreme Cold or Heat
In Denver’s climate, this matters. Charging a cold iPhone — brought in from a freezing car, for example — causes lithium plating on the anode that permanently reduces capacity. Charging in extreme heat similarly accelerates chemical aging. Try to let your phone reach room temperature before charging when it’s been in cold conditions.
Use Optimized Battery Charging
As mentioned earlier, this iOS feature prevents your battery from sitting at 100% unnecessarily and meaningfully slows the rate of capacity loss over time. Keep it on.
Reduce Background Activity
Background App Refresh, location services running constantly, and push email for multiple accounts all keep the processor active when you’re not using the phone — which drains the battery and requires more frequent charging cycles. Go to Settings → General → Background App Refresh and turn off apps that don’t need real-time updates.
Avoid Wireless Charging for Every Charge
MagSafe and Qi wireless charging are convenient but generate more heat than wired charging — and heat is the enemy of battery longevity. Use wireless charging selectively, not as your primary daily charger. A standard Lightning or USB-C cable generates less thermal stress on the battery.
Section 5: When Checking Isn’t Enough — Signs You Need a Replacement {#section5}
Knowing how to check iPhone battery health is helpful, but sometimes the Battery Health screen doesn’t tell the full story. Here are the real-world signs that replacement is needed regardless of what the percentage shows.
Unexpected Shutdowns Under Load
If your iPhone shuts off during demanding tasks — gaming, taking photos, video calls — even when the battery shows 30% or higher, the battery can no longer deliver peak current. This is a hardware failure, not a software issue, and it will get worse over time.
The Phone Gets Unusually Hot During Normal Use
A battery working harder than it should generates excess heat as a byproduct. If your iPhone gets noticeably warm during texting, browsing, or casual use — especially paired with fast drain — the battery is the likely cause.
Swollen or Physically Deformed Phone
If your iPhone looks slightly thicker than usual, or the screen appears to be slightly lifted at one edge, the battery may be swelling. A swollen lithium-ion battery is a safety concern. Stop charging the phone and bring it in immediately. Don’t try to open the phone or puncture the battery. Contact iMobile Denver right away if you suspect this is happening.
Battery Health % Drops Rapidly Week to Week
Healthy batteries lose roughly 1% of capacity every 1–2 months under normal use. If your Maximum Capacity is dropping noticeably week to week, the battery has a manufacturing defect or has been damaged by charging habits and should be replaced.
FAQs: How to Check iPhone Battery Health {#faqs}
Can I check iPhone battery health without going into Settings? The quickest way is Settings → Battery → Battery Health & Charging. There’s no shortcut or widget for this on the lock screen by default. Third-party apps claim to show battery health data, but they access the same underlying iOS information — the Settings menu is the most accurate and direct source.
Is 85% battery health good for a 2-year-old iPhone? Yes — 85% after two years of normal use is within Apple’s expected range. The phone should still perform well for daily use. If you’re noticing range issues, a replacement will make a meaningful difference. If battery life still feels acceptable, monitoring it every month or two is sufficient.
Does checking battery health damage the battery? No. Checking the Battery Health screen is a passive read of stored data — it doesn’t stress the battery or run any tests. Check as often as you like.
My battery health is 100% but my phone still dies fast. What’s wrong? A 100% reading on a newer iPhone usually means the battery genuinely is in good condition. If battery life is still poor, the issue is more likely software-related — background apps, display brightness, location services, or a rogue app draining power. Check Settings → Battery to see which apps are consuming the most power. If software fixes don’t help, bring it in for a free diagnostic at iMobile Denver.
How much does iPhone battery replacement cost in Denver? The cost varies by model. Use our instant quote tool to get a transparent price for your specific iPhone before you come in. First-time customers also get $10 off.
Can iMobile Denver replace the battery on any iPhone model? Yes. We replace batteries on all iPhone models from older generations through the current lineup. Visit our iPhone repair page for more details, or stop in at 1272 S Sheridan Blvd during business hours — no appointment needed.
This article is for informational purposes only. For an accurate assessment of your specific iPhone battery and whether replacement is the right call, bring your device into iMobile Denver at 1272 S Sheridan Blvd, Denver CO 80232, or use our instant quote tool to get started.
