The iPhone 15 battery capacity is about 3349 mAh, which is about 12.98 Wh, going by certification filings and repair teardowns. Apple does not list a mAh number in its phone specifications. They give playback hours, so every mAh figure you see for this phone is a reported one and not a line from the maker's brochure.
That is a smaller figure than most Android phones in India, which sit at 5000 mAh or more. The two numbers cannot be compared directly, because iOS and the phone's hardware use power differently. On this page you get the capacity, a table against nearby iPhones, real battery life, charging speed and the exact steps to check battery health on your own phone.
Quick facts
Step by step
Open the battery page in Settings
Open Settings and tap Battery. Then tap Battery Health & Charging.
Read the Maximum Capacity line
The line called Maximum Capacity shows a percentage against a new battery. A new iPhone 15 should show a figure near 100 percent.
Look for a service message
If the page says the battery needs service, or the figure has dropped low, note it down. Take a screenshot so you can show it at the counter.
Check the charging options on the same page
On the same screen, see whether Optimised Battery Charging is on. Newer iOS versions may also offer a charge limit option here.
Compare with how the phone behaves
A good percentage with sudden shutdowns is rare. If the number looks fine but the phone still misbehaves, ask for a proper battery test.
What the iPhone 15 battery capacity is, in mAh and Wh
The figure most often reported for the iPhone 15 is 3349 mAh, which comes to about 12.98 Wh. The mAh number is taken from certification papers and from repair technicians who open the phone and read the cell, so treat it as a close, well-agreed figure and not as a maker statement.
You can move between the two units yourself. Take the iPhone 15's 3349 mAh, times the cell voltage, then slide the decimal three places left to land near 12.98 Wh. For this phone, 3349 mAh at about 3.88 V gives about 13.0 Wh, which matches the watt hour figure. Watt hours are the fairer way to compare two phones, because they include the voltage.
This is a typical figure for the cell. A rated (minimum) value may be printed on the cell itself, but it is not given in Apple's phone specifications, so do not quote one for this phone.
iPhone 15 against the nearest iPhones
The base iPhone 15 has a slightly larger pack than the iPhone 14 and the iPhone 13. The Plus and Pro Max are the big-battery versions. Figures below are reported from filings and teardowns, so small differences between sources are normal.
| Phone | Reported capacity | Note |
|---|---|---|
| iPhone 15 | About 3349 mAh | About 12.98 Wh |
| iPhone 15 Plus | About 4383 mAh | Bigger pack than the base phone |
| iPhone 15 Pro | About 3274 mAh | Slightly smaller than the base phone |
| iPhone 15 Pro Max | About 4441 mAh | Largest in the range |
| iPhone 14 | About 3279 mAh | See the iPhone 14 page |
| iPhone 13 | About 3227 mAh | See the iPhone 13 page |
Many buyers are surprised that the iPhone 15 Pro has a slightly smaller pack than the iPhone 15. A bigger mAh number on a rival phone does not tell you the whole story either. For the newer generation, open the iPhone 16 battery page, and for every model in a single list use the iPhone battery capacity hub.
How long the iPhone 15 battery really lasts
Apple states the phone gives up to 20 hours of video playback, up to 16 hours of streamed video and up to 80 hours of audio playback. These are test results under set conditions, with fixed brightness and a steady signal. Your day will look different.
- A bright screen outdoors, a weak mobile signal and a long hotspot session all pull the number down.
- Camera, video calls and games use the most power per minute.
- Light use with Wi-Fi, calls and messages usually carries the phone through a working day.
The pack is small next to an Android phone with 5000 mAh, yet the phone often lasts well because the software and hardware are made together. Capacity alone does not decide screen-on time.
A customer said their new phone was weak because a friend's Android showed 5000 mAh. The technician explained that the two numbers are not equal terms, and asked for a week of screen-time figures before judging. After a few days the phone was clearly lasting a full day.
Charging the iPhone 15: connector, speed and habits
The iPhone 15 moved to a USB-C port. Apple says that with a 20 W adapter or higher, it can charge to about 50 percent in about 30 minutes. That is a claim for an empty phone and a suitable adapter, so a lower-watt adapter takes longer, and the last part of the charge is always slower.
Charging time depends on the charger and the cable, not on mAh alone. Use a good quality cable and an adapter that meets the phone's needs. A very cheap cable can slow the charge or get warm at the plug.
Warmth and many hours spent at a full battery wear out any cell sooner. Remove a thick case while charging if the phone feels warm, keep it off soft bedding while it charges, and out of strong sunlight. The Optimised Battery Charging setting helps by holding the phone below full for part of the night.
How to check the health of an iPhone 15 battery
Battery health on an iPhone is easy to see. Go to Settings, choose Battery, and open Battery Health & Charging. The Maximum Capacity figure compares the battery now with a new one. Apple explains how this reading works and what the messages mean on its battery help page.
Apple says the iPhone 15 battery is built to hold on to as much as 80 percent of its original capacity after 1000 complete charge cycles. A cycle means the total of 100 percent of charge being used, which can be spread over several days, and is not one full drain and refill. Newer iOS versions may also show a cycle count in the About screen, but menu names change, so search for the word battery inside Settings if a line is missing.
For a general method that suits any handset, read our battery health check page. If the drain looks odd even with good health, why a battery drains fast explains the usual app and signal causes.
Common mix-ups about the iPhone 15 battery figure
- Plus versus base phone. A 4383 mAh figure belongs to the iPhone 15 Plus, not to the phone you may hold. Check the name in Settings under General and About.
- Watt hours versus mAh. A page that says 12.98 and a page that says 3349 are talking about the same pack in two units.
- Inflated numbers. Replacement packs sold with a much higher mAh claim than the original are not trustworthy. A pack cannot honestly hold far more in the same space.
- Third-party apps. Apps that claim to show real mAh on an iPhone cannot read the true cell figure, so do not rely on them.
If you want a different phone's number, the hub page lists the full range in one place, and the iPhone 13 page covers the older model.
When the battery needs replacing
A battery that has aged shows a low Maximum Capacity figure, quick drops in charge, or shutdowns at a higher percentage than before. Replacement of an iPhone battery should go through Apple's own repair route or an authorised provider, which you can read about on Apple's repair page. For wider fitting advice, see the mobile battery replacement guide.
If the screen lifts, the back glass rises, or the phone becomes too hot to hold, unplug it at once and take it to an authorised provider. Never squeeze the phone or poke at the glass. Cheap packs with inflated capacity claims are common, so avoid any pack that cannot be traced.
Take a screenshot of the Maximum Capacity page before you go for service. It gives the technician a starting point and tells you later whether the new pack really changed the reading.
Frequently asked questions
What is the iPhone 15 battery capacity in mAh?
It is about 3349 mAh, as reported from certification filings and teardowns. Apple does not list mAh in its phone specifications, so this is not a maker figure.
How many watt hours is the iPhone 15 battery?
About 12.98 Wh. At about 3.88 V, that matches the 3349 mAh figure, since multiplying mAh by volts and dividing by a thousand gives about 13 Wh.
Is the iPhone 15 battery bigger than the iPhone 14?
Slightly. The iPhone 14 is reported at about 3279 mAh, against about 3349 mAh for the iPhone 15. The gap is small, and daily life depends more on use and settings.
Why is the iPhone 15 battery so much smaller than Android phones?
iPhones are designed with software and hardware together and use less power for the same job. A bare mAh comparison across iOS and Android is not a fair test.
How can I see my iPhone 15 battery capacity on the phone?
The phone does not show mAh. Open Settings, Battery, then Battery Health & Charging to see Maximum Capacity as a percentage of a new battery.
Does the iPhone 15 Plus have a bigger battery?
Yes. The Plus is reported at about 4383 mAh, which is a lot more than the 3349 mAh of the base phone, and it gives longer use per charge.