If your phone suddenly charges extremely slowly after reaching 80%, don’t panic — this is very common on both Android and iPhone devices. Many users think something is wrong with the charger, battery, or charging port, but in reality, most phones intentionally slow down charging once they reach 70–85%.
This guide explains why charging slows down after 80%, what is normal, what is NOT normal, and exactly how to fix slow charging when your phone seems stuck between 80–95%.
Why Your Phone Charges Slowly After 80%
There are several reasons — some completely normal, others signs of a problem. Here are the main causes:
- Battery protection features (Adaptive Charging, Optimized Charging)
- Fast charging automatically slows down after 80%
- High temperature while charging
- Old or degraded battery health
- Cheap or slow charger
- Dirty charging port
- Charging while using the phone
- Too many apps running in the background
Below are the exact fixes to solve the problem.
Fix 1: Understand That Slow Charging After 80% Is Normal
Most phones follow a charging pattern:
- 0%–50%: Extremely fast
- 50%–80%: Moderate speed
- 80%–100%: Very slow
This is intentional and protects your battery from overheating or degrading quickly.
If the phone finishes charging in 1–2 hours total, this is normal.
However, if it takes more than **2 hours to go from 80% to 100%**, this guide will help you fix it.
Fix 2: Turn Off “Optimized Charging” or “Adaptive Battery”
Your phone may be slowing charging on purpose to extend battery life.
On Samsung:
- Settings → Battery → Charging
- Turn off Protect Battery (limits charging to 85%)
On Xiaomi/Redmi/Poco:
- Settings → Battery → Battery Saver
- Turn off Optimized Charging
On OnePlus:
- Settings → Battery
- Disable Optimized Charging
On iPhone:
- Settings → Battery → Battery Health
- Turn off Optimized Battery Charging
Turning this off will noticeably speed up charging after 80% — but long-term battery health will decrease slightly.
Fix 3: Remove the Case and Cool Down the Phone
Slow charging after 80% often happens because the phone got too hot. Batteries charge slower when warm to avoid damage.
Do this:
- Remove the phone case
- Stop using the phone while charging
- Charge in a cool room
- Avoid charging on soft surfaces like beds
Cooling the phone can increase charging speed immediately.
Fix 4: Turn Off Fast Charging and Then Turn It Back On
Sometimes fast charging gets stuck or glitches, causing the phone to get stuck at slow speed.
- Go to Settings → Battery → Fast Charging
- Turn it OFF
- Wait 10 seconds
- Turn it ON again
This resets the charging algorithm and can make charging after 80% faster.
Fix 5: Restart Your Phone Before Charging
A restart clears background apps and resets the charging controller.
Restart → Plug charger → Leave the phone untouched
Many users report faster charging after 80% with this simple method.
Fix 6: Close Heavy Background Apps
Even small apps running in the background drain power while charging:
- Snapchat
- TikTok
- Games
- VPN apps
Close everything:
- Recent Apps → Close All
This stops the phone from overheating and increases charging speed.
Fix 7: Use a Better Charger and Cable
If your charger is weak, the phone will charge extremely slowly after 80%.
Check your equipment:
- Use the original charger
- If not available, use a certified brand charger (Anker, Samsung, Baseus)
- Use at least a 20W charger (higher is better)
- Try a new USB-C cable
Low-quality cables slow charging dramatically after 80%.
Fix 8: Clean Your Charging Port
Dirt or dust inside the port can interrupt charging flow.
How to clean safely:
- Turn off your phone
- Use a wooden or plastic toothpick
- Remove dust gently
Do NOT use metal objects or compressed air cans.
Fix 9: Disable Battery Saver Mode
Battery saver mode intentionally slows down charging.
- Settings → Battery
- Turn off Power Saving Mode
Charging will instantly become faster.
Fix 10: Switch to Airplane Mode
Airplane mode reduces battery usage and speeds up charging.
How:
- Swipe down Quick Panel → Tap Airplane Mode
This can reduce charging time by 10–20%.
Fix 11: Avoid Using Your Phone While Charging
If you’re scrolling TikTok, watching YouTube, or playing games, your phone will charge extremely slowly after 80%.
Solution: Let the phone rest while charging.
Fix 12: Check Battery Health
If your battery is old or damaged, charging will slow dramatically after 80%.
Signs of a weak battery:
- Drains fast
- Phone gets hot easily
- Charging speed varies a lot
- Battery percentage jumps up or down
If the battery is below 75–80% health, consider replacing it.
Fix 13: Turn Off Unnecessary Connectivity
Disable things you’re not using:
- WiFi
- Bluetooth
- Mobile data
- NFC
- Hotspot
These drain battery and slow charging down.
Fix 14: Update Your Phone Software
Software updates often fix battery management issues.
Update:
- Settings → Software Update → Download & Install
Fix 15: Reset Battery Stats (Advanced)
Sometimes battery calibration gets corrupted.
To reset battery stats:
- Use phone normally until it reaches 0% and shuts off
- Charge to 100% without turning it on
- Turn on the phone after it’s fully charged
This recalibrates the battery.
Fix 16: Factory Reset (Last Resort)
If nothing helps, you may have deep software issues.
WARNING: Backup your data before resetting.
To reset:
- Settings → System → Reset Options → Erase All Data
Conclusion
Charging slowing down after 80% is usually normal — but if it becomes extremely slow, it may be caused by overheating, a weak charger, background apps, or battery health issues. By following the fixes above, you can restore fast charging completely.