The clearest signs your iPhone is charging right now
Your iPhone shows you it is charging in three ways at once, so you can check any of them. The most obvious is the lightning bolt icon next to the battery percentage on your home screen — if you see that bolt, current is flowing into the battery. On the lock screen, the battery icon itself fills with color as it charges, moving from empty to full. If you have a newer iPhone with Dynamic Island (the pill-shaped cutout at the top), the charging status appears there too.
The third signal is physical: your phone gets warm during charging, especially in the first 20 minutes. This is normal. If it gets too hot to hold comfortably, that is a separate problem — unplug it and let it cool down before trying again.
If you see none of these signs after plugging in, the connection is not working. Move to the troubleshooting sections below.
Key Takeaways
- A lightning bolt icon next to your battery percentage means charging is happening right now.
- The battery icon on your lock screen fills with color as you charge, and you can swipe down from the top to see a larger battery view.
- Check the charging port and cable for lint, debris, or visible damage before assuming the phone or charger is broken.
- Wireless charging works only on iPhone 8 and newer models, and the phone must be centered on the pad with no thick case blocking the connection.
- If your phone charges with one cable but not another, the problem is the cable or power adapter, not the phone.
Where to look on your screen for charging status
The lightning bolt appears in the top-right corner of your home screen, right next to the battery percentage number. On iPhone models without a percentage display, you can swipe down from the top-right corner to open Control Center and see a larger battery icon that shows the exact percentage and whether charging is active.
On your lock screen, the battery icon sits in the top-right corner and fills with green color as the phone charges. The fuller the icon, the higher the charge. Once the battery reaches 100 percent, the lightning bolt disappears and the icon stops changing color.
If you have an iPhone 14 Pro, 15, or newer model with Dynamic Island, the charging status appears in that top-center area along with other notifications. You do not need to unlock the phone to see any of these indicators.
What to check if the lightning bolt does not appear
Start with the cable and port. Unplug the phone and look inside the charging port at the bottom of the iPhone — use a flashlight and look for lint, dust, or debris packed inside. If you see anything, use a wooden toothpick or a plastic phone cleaning tool to gently remove it. Do not use metal, which can damage the port. Then inspect the charging cable itself for visible cracks, fraying, or bent connectors.
Plug the cable back in slowly and listen for a subtle click as the connector seats fully. The connector should sit flush with no gaps. If it feels loose or wiggly, the port may be damaged or the cable connector may be bent.
Try a different power adapter if you have one available. If the phone charges with a different adapter, your original charger is the problem. If it charges with a different cable but not the original one, the cable is the problem. If it does not charge with any cable or adapter, the port itself may need service.
Wireless charging and what prevents it from working
Wireless charging works on iPhone 8 and all newer models. You place the phone face-up or face-down on a wireless charging pad, and the battery begins charging without a cable. You should see the lightning bolt icon appear within a few seconds, just as you would with a wired charger.
If the lightning bolt does not appear, the phone is not centered on the pad. Move it around slightly until you see the icon. Thick phone cases, metal attachments, or credit card holders between the phone and the pad can block the wireless signal — remove the case or holder and try again. Some cases are labeled as wireless-charging compatible, but even those can interfere if they are very thick.
Make sure the wireless charger itself is plugged into power. A charger that is not receiving electricity will not charge your phone, and you will see no lightning bolt. Check that the power cable is fully inserted into both the charger and the wall outlet.
Why your phone charges slowly or stops charging partway
Slow charging usually means the charger is not delivering full power. This happens most often with older chargers, chargers designed for lower-power devices, or chargers that are damaged. An iPhone 15 with a 20-watt charger will charge faster than the same phone with a 5-watt charger. Check the wattage printed on your power adapter — higher numbers mean faster charging.
If charging stops at 80 percent and will not go higher, your iPhone has activated optimized battery charging, a feature that slows charging near the end to extend battery lifespan. This is intentional and normal. You can turn it off in Settings > Battery > Battery Health & Charging, but Apple recommends leaving it on.
Heat also slows charging. If your phone is warm, it may pause charging to cool down. Move it away from direct sunlight, remove the case, and let it rest for a few minutes. Charging will resume once the temperature drops.
Checking battery health to understand long-term charging problems
If your phone charges but the battery drains very quickly afterward, the battery itself may be aging. Go to Settings > Battery > Battery Health & Charging and look at the Maximum Capacity percentage. This number tells you how much charge your battery can hold compared to when it was new.
A new iPhone battery is at 100 percent capacity. After a few years of regular charging, it naturally drops to 80 or 90 percent. This is normal wear. If the number is below 80 percent and your phone is more than two years old, the battery is aging but does not need replacement yet. If it is below 50 percent, the battery is significantly worn and Apple recommends service.
The Battery Health screen also shows the Charging Optimization status. If it says "Optimized Battery Charging is On," your phone is using the feature described above. This does not mean anything is wrong — it means your phone is protecting the battery from unnecessary stress.
When to seek service or replace the charger
If you have ruled out cable and port problems — you have cleaned the port, tried multiple cables and adapters, and the phone still will not charge — the charging port itself may be damaged. Apple Stores and authorized repair shops can test this and replace the port if needed. Bring your phone and one of the cables you have tested.
If the phone charges with one cable but not others, replace the cables that do not work. Third-party cables are cheaper than Apple cables, but buy from a reputable seller. Damaged or counterfeit cables can harm your phone or charger.
If your phone charges but the battery drains in hours even when not in use, and the maximum capacity is below 50 percent, a battery replacement is the most cost-effective fix. This costs less than a new phone and restores charging and battery life to near-new performance.
Frequently Asked Questions
Why does my iPhone get hot while charging?
Some heat during charging is normal, especially in the first 20 minutes. Your phone generates heat as electricity flows into the battery. If it is too hot to hold comfortably, unplug it and let it cool. Repeated overheating can damage the battery, so if this happens every time you charge, try a lower-wattage charger or remove the case while charging.
Can I use any USB-C cable with my iPhone 15?
iPhone 15 and 15 Pro use USB-C, and most USB-C cables will work. However, Apple certifies certain cables for full charging speed. A non-certified cable may charge more slowly or not at all. If you have charging problems with a third-party cable, try an Apple cable to confirm the issue is the cable, not the phone.
Does leaving my iPhone plugged in overnight damage the battery?
No. Modern iPhones stop charging at 100 percent and do not continue to push electricity into the battery. Optimized Battery Charging also slows charging near 100 percent to reduce stress. Leaving your phone plugged in overnight is safe and will not harm the battery.
What does the orange lightning bolt mean instead of the white one?
An orange or yellow lightning bolt means your phone is in Low Power Mode, a feature that reduces performance to extend battery life. The phone is still charging normally — the color just indicates the mode is active. You can turn off Low Power Mode in Settings > Battery, or it will turn off automatically once the battery reaches 80 percent.
Can I charge my iPhone while it is in airplane mode?
Yes. Airplane mode does not affect charging. The phone will charge at the same speed whether airplane mode is on or off. Turning on airplane mode may slightly reduce heat during charging because the phone is not searching for networks, but it is not necessary.