Your phone is plugged in and shows the charging symbol, but the battery percentage is barely moving. Maybe it used to charge quickly and suddenly became slow, or fast charging no longer seems to work at all.
In most cases, a phone charging slowly is caused by the charger, cable, charging port, excessive heat, using the phone while charging, wireless charging problems, battery protection settings, or an aging battery.
The good news is that you can usually identify the cause without resetting your phone or replacing the battery. Start with the simple checks below.
Quick Answer
If your phone is charging slowly, plug it directly into a wall outlet using a charger and cable that support your phone's fast-charging standard. Stop using the phone while it charges, check the charging port for debris, let the device cool down if it is hot, and test another compatible cable or charger. Also check whether a battery protection or charging-limit feature is intentionally slowing or stopping charging.
Why Is My Phone Charging So Slowly?
Charging speed depends on more than the charger plugged into the wall. The phone, power adapter, cable, battery temperature, battery level, charging protocol, and what you are doing on the phone can all affect how quickly power reaches the battery.
Common causes of slow phone charging include:
- A low-power or incompatible charger
- A damaged or low-quality charging cable
- Charging from a computer, car USB port, or low-power USB hub
- Dust or debris inside the charging port
- Using demanding apps while charging
- The phone becoming too hot or too cold
- Fast charging being disabled
- A battery protection or charging-limit feature
- Poor wireless charger alignment
- A thick or incompatible phone case
- An aging or damaged battery
The best approach is to test these possibilities one at a time.
1. Use the Right Charger
A charger can successfully charge your phone without providing enough power for its fastest supported charging speed.
This is particularly common when using an older charger from another device.
Check the specifications for your phone and make sure the charger supports the charging technology required by the device.
Depending on the phone, this may include technologies such as USB Power Delivery (USB-PD), PPS, or a manufacturer-specific fast-charging standard.
You do not necessarily need a charger with an extremely high wattage. Your phone controls how much power it accepts. What matters is that the charger and cable support a compatible charging standard and enough power for your device.
Samsung explains that fast charging requires a compatible adapter, cable, and device. You can read Samsung's official Galaxy charging tips for more information.
Apple similarly recommends an appropriate USB-C Power Delivery charger for faster wired charging on supported iPhones. See Apple's official guide to iPhone charging speeds.
2. Check the Charging Cable
The power adapter is only half of the charging setup. The cable also needs to support the required charging speed.
A cable can still charge your phone even when it is damaged internally or incapable of carrying enough power for fast charging.
Inspect the cable for:
- Fraying
- Sharp bends
- Loose connectors
- Exposed wiring
- Heat around either connector
- Charging that starts and stops when the cable moves
If you have another known-good compatible cable, test it with the same charger.
If charging suddenly becomes much faster, the original cable was probably limiting the charging speed.
Do not continue using a cable with exposed wires, burned connectors, or obvious physical damage.
3. Use a Wall Outlet Instead of a Computer
Where you plug in the charger matters.
A USB port on a laptop, desktop computer, car, monitor, or USB hub may supply less power than a dedicated wall charger.
For the best test:
- Disconnect the phone from the computer or USB hub.
- Connect your compatible charger directly to a wall outlet.
- Use a known-good charging cable.
- Lock the phone screen.
- Check whether the estimated charging time improves.
Google specifically recommends using a wall outlet when faster Pixel charging is needed because other sources, such as laptops, can charge more slowly. See Google's official Pixel charging guide.
If you use a multi-port charger, keep in mind that some chargers divide their available power when several devices are plugged in simultaneously.
4. Check the Charging Port
Lint, dust, or other debris inside the charging port can prevent the cable from making a solid connection.
Signs of a dirty or damaged port include:
- The charging cable does not sit firmly
- Charging repeatedly connects and disconnects
- Fast charging suddenly disappears
- The cable works only when positioned at a certain angle
- The phone detects moisture or a charging-port problem
Turn the phone off and inspect the port with good lighting.
If you can clearly see loose surface debris, remove it carefully using a dry, soft, non-metallic brush. Do not force anything deep inside the port and do not use metal objects.
If the charging port appears bent, corroded, burned, wet, or physically damaged, stop trying to repair it yourself and have the phone inspected.
Apple also recommends checking the charging port and removing debris when an iPhone charges slowly or does not charge. See Apple's iPhone charging troubleshooting guide.
5. Stop Using the Phone While Charging
Your charger is supplying power while the phone itself is consuming power.
If you are gaming, streaming video, recording video, using navigation, making video calls, or running other demanding apps, a significant portion of the charger's power may be used to operate the phone instead of increasing the battery percentage.
This can make it appear that your phone is charging extremely slowly.
For a simple test:
- Connect the phone to the charger.
- Close demanding apps.
- Turn the screen off.
- Leave the phone alone for about 15 minutes.
- Check how much the battery percentage increased.
Samsung specifically notes that browsing, video streaming, gaming, and other demanding activity while charging can increase temperature and reduce charging speed.
6. Let the Phone Cool Down
Modern smartphones can automatically reduce charging speed when the battery becomes too hot or too cold.
This is a protection feature rather than necessarily a charging fault.
If your phone feels unusually warm:
- Stop using demanding apps
- Remove it from direct sunlight
- Move it to a cooler room
- Remove a thick case temporarily if necessary
- Let the screen remain off while charging
Do not try to rapidly cool a hot phone using a freezer, refrigerator, ice pack, or water. Allow it to return naturally to a normal room temperature.
Apple, Google, and Samsung all document temperature-related charging limits on their devices.
If your device becomes excessively hot every time you connect the charger, read our separate guide on how to fix a phone overheating while charging.
7. Check Fast-Charging Settings
Some Android phones provide settings that control fast wired or wireless charging.
On supported Samsung Galaxy phones, check:
Settings > Battery > Charging settings
Look for options such as:
- Fast charging
- Fast wireless charging
Make sure the appropriate option is enabled.
The exact wording and location can vary depending on your Galaxy model and software.
Also remember that enabling the setting alone cannot make an incompatible charger charge faster. Your phone, cable, and charger must all support the required charging mode.
Samsung provides current instructions on its Galaxy Battery charging support page.
8. Restart Your Phone
If your charging equipment appears fine, restart the phone.
A temporary system process or background app can sometimes consume enough power to make charging appear slower than normal.
After restarting:
- Connect the phone to the wall charger.
- Leave Wi-Fi, games, navigation, and video apps alone temporarily.
- Turn the screen off.
- Check the battery percentage again after 15–20 minutes.
If charging speed returns to normal after the restart, the issue was likely temporary.
9. Check Battery Protection and Charging Limits
Your phone may be deliberately delaying or stopping charging to reduce long-term battery wear.
This is particularly important if your phone charges normally until around 80%, 85%, 90%, or another specific percentage and then slows dramatically or stops.
On iPhone
Open:
Settings > Battery > Charging
Depending on your iPhone, you may see a Charge Limit or Optimized Battery Charging setting.
Apple explains how these features work in its Charge Limit and Optimized Battery Charging guide.
On Google Pixel
On supported Pixel phones, look under:
Settings > Battery > Battery health > Charging optimization
Adaptive Charging can adjust when the phone reaches a full charge, while a charging-limit option can intentionally stop the battery around a configured level.
On Samsung Galaxy
Open:
Settings > Battery > Battery protection
Depending on the device, Battery protection can intentionally control when charging stops or resumes.
Samsung explains the available behavior in its official Galaxy maximum charge level guide.
These features do not mean your battery or charger is broken. They are designed to manage battery charging behavior.
10. Troubleshoot Slow Wireless Charging
Wireless charging is especially sensitive to alignment, temperature, cases, charger compatibility, and objects between the phone and charging pad.
If wireless charging is slow:
- Center the phone correctly on the charging pad.
- Remove a very thick or incompatible case.
- Remove cards, metal plates, magnets, or other objects between the phone and charger.
- Make sure the wireless charger supports your phone's charging standard.
- Use the correct power adapter for the wireless charging pad.
- Keep the phone and charger cool.
- Avoid repeatedly moving the phone while it charges.
If possible, test wired charging.
If the phone charges quickly by cable but slowly only on the wireless charger, the phone's battery is less likely to be the main problem.
Google notes that incompatible cases, excessive heat, older wireless standards, and charger capability can affect Pixel wireless charging speed. Apple similarly notes that cases and objects between an iPhone and wireless charger can reduce charging performance.
For iPhone users, see Apple's official wireless charging instructions.
11. Check Battery Health or Hardware
If your phone remains extremely slow to charge with multiple known-good chargers and cables, the problem may be related to the battery, charging port, or other internal hardware.
Signs that professional inspection may be appropriate include:
- The phone is several years old and battery life has become much shorter
- Charging remains slow with multiple compatible chargers
- The charging port is visibly damaged
- The cable repeatedly disconnects
- The phone gets abnormally hot while charging
- The battery percentage jumps unexpectedly
- The battery drains unusually quickly after charging
- The battery or phone body appears swollen
If the battery appears swollen, stop charging and using the device and arrange professional service.
Do not attempt to puncture, flatten, or remove a swollen lithium-ion battery yourself.
If the phone otherwise works normally, have the charging port and battery tested before replacing the entire device.
Phone Charging Slowly on Android: Best Order to Try
If your Android phone suddenly starts charging slowly, try these steps in order:
- Use a compatible wall charger.
- Test another compatible cable.
- Check the USB-C charging port.
- Stop using the phone while charging.
- Allow the phone to cool down.
- Check fast-charging settings if your phone provides them.
- Restart the phone.
- Check Battery protection or Charging optimization.
- Test wired charging if wireless charging is slow.
- Check for available system updates.
- Have the battery or charging port inspected if nothing helps.
Menu names vary between Samsung, Google Pixel, Motorola, OnePlus, and other Android manufacturers, so use the search box inside Settings if you cannot find a charging option.
iPhone Charging Slowly: What to Check
If an iPhone is charging more slowly than expected, start with the charger and cable.
On recent iPhones, you can also open:
Settings > Battery
Your iPhone may display charging information indicating that the connected charger is slower than what the phone can support.
Apple recommends checking:
- The power adapter
- The charging cable
- The charging port
- The power source
- Phone temperature
- Usage while charging
- Charge Limit or Optimized Battery Charging
For Apple's current recommendations, see About iPhone charge speeds.
Why Does My Phone Charge Fast at First and Then Slow Down Near 80%?
Charging more slowly as the battery gets closer to full can be normal.
Phones manage charging dynamically to control battery temperature and reduce unnecessary battery stress. Battery protection features may also intentionally delay charging or stop at a configured level.
Therefore, a phone that charges quickly from a low battery percentage but slows near the top does not automatically have a charging problem.
However, if the phone takes unusually long to charge even when the battery is low, test the charger, cable, power source, temperature, and charging port using the steps above.
Frequently Asked Questions
Why is my phone charging slowly all of a sudden?
A sudden change in charging speed is commonly related to the charger or cable, debris in the charging port, excessive heat, high power usage while charging, a charging setting, or a temporary software issue. Test another compatible cable and charger before assuming the battery is faulty.
Why is my fast charger charging slowly?
The adapter may support fast charging while the cable does not, or the charger may use a charging standard that your phone does not support. Temperature, battery level, phone usage, and charging settings can also reduce the actual charging speed.
Can a bad cable cause slow charging?
Yes. A damaged, worn, or incompatible cable can still deliver power while limiting the charging speed. Testing another known-good compatible cable is one of the easiest ways to diagnose slow charging.
Why does my phone charge slowly from my laptop?
Many computer USB ports supply less charging power than a dedicated compatible wall charger. Connect the phone directly to a wall adapter to compare the charging speed.
Does using my phone while charging make it charge slower?
Yes. Gaming, streaming video, navigation, camera use, video calls, and other demanding activities consume power while the charger is trying to refill the battery. They can also increase temperature, which may cause the phone to reduce charging speed further.
Why does my phone stop charging at 80%?
A battery protection, charging-limit, or adaptive charging feature may be active. Excessive battery temperature can also cause some phones to pause or limit charging temporarily.
Should I factory reset my phone because it charges slowly?
No. A factory reset should not be an early solution for slow charging. First test the charger, cable, outlet, charging port, temperature, charging settings, and battery health. Most slow-charging problems can be diagnosed without deleting your data.
How do I know if my phone battery needs replacing?
Consider having the battery tested if it has significantly reduced runtime, shuts down unexpectedly, becomes unusually hot, charges abnormally despite known-good accessories, or shows other signs of deterioration. A swollen battery should be treated as a safety issue and professionally serviced.
Final Thoughts
If your phone is charging slowly, start with the charger and cable rather than assuming the battery is failing. Use a compatible wall charger, test another cable, check the charging port, and leave the phone idle while charging.
If charging remains slow, check temperature, fast-charging settings, battery protection features, and wireless charging alignment. A phone that still charges unusually slowly with multiple compatible chargers and cables may need its battery or charging hardware inspected.