Why Your Phone Charges Slowly (and How to Fix It)

Slow charging is usually something simple

When a phone that used to charge quickly starts crawling, most people assume the battery is dying. Often it isn't. The cause is usually the charger, the cable, the port, heat or a setting doing exactly what it was designed to do.

Work through the checks below in order. They start with the simplest things to rule out, and finish with how to tell a charging port problem from a battery problem.

1. Check the power adapter

The small adapter that plugs into the wall decides how much power your phone can get. An old, low-power cube from years ago, a hotel lamp socket or a laptop's USB port will all charge slowly no matter how healthy your phone is.

• iPhone: fast charging needs a USB-C Power Delivery adapter rated at 20W or higher, plus a USB-C cable.
• Samsung Galaxy: Super Fast Charging needs a compatible USB-C adapter that supports it, and the fast charging options switched on in your battery settings.
• Google Pixel: use a USB-C Power Delivery adapter for the quickest wired charging.

Check the wattage printed on your adapter. If you're not sure, borrow one you know charges another phone quickly and compare.

2. Swap the cable

Cables wear out long before they look broken. Bends near the connector, a frayed jacket or a plug that feels loose can all reduce charging speed or make it drop in and out. Bargain cables and some older USB-A cables also can't carry fast-charging power at all.

Try a different cable that you know works well. If charging speeds up, you've found the problem.

3. Look inside the charging port

Pocket lint packs into charging ports over time. It stops the plug from seating fully, so the connection is weak or intermittent. Signs include a plug that doesn't click in firmly, sits slightly proud of the phone or needs holding at an angle to charge.

Shine a light into the port and look. Never use pins, paper clips or anything metal to dig it out, as you can short or bend the contacts. If you can see buildup you can't safely remove, a technician can clean it properly. Our post on iPhone charging port problems covers more troubleshooting steps.

4. Stop using it heavily while it charges

Gaming, video calls, navigation and streaming all use power while the phone is trying to charge. Combine that with a weak adapter and the battery barely moves. The heat they produce also slows charging down further.

For a quick top-up, close heavy apps, lower the brightness and let the phone sit. Turning on Low Power Mode or Battery Saver while it charges can help too.

5. Let it cool down

Phones protect their batteries by slowing or pausing charging when they get too warm. An iPhone may show a notice that charging is on hold until it returns to normal temperature. Common causes are charging under a pillow, in direct sun, in a thick case or on a car dashboard.

Move the phone somewhere cooler and, if it's very warm, take it out of its case while it charges.

6. Check your charging settings

Modern phones include battery-protection features that deliberately slow or pause charging, usually around 80%, to reduce wear. iPhone has Optimized Battery Charging, Samsung has battery protection options, and Pixel has Adaptive Charging. If your phone sits at 80% for a while overnight and finishes before you usually wake up, that's the feature working, not a fault.

Wireless charging is also naturally slower than a good wired connection, and a misaligned phone or thick case can slow it more.

7. Consider battery wear

An ageing battery is more likely to drain quickly than to charge slowly. Still, a worn battery can charge erratically, jump between percentages or heat up during charging. Check your battery health in settings, and see our phone battery guide for what the readings mean. If the phone looks swollen or the screen is lifting, stop charging it and get it checked.

Charging port or battery? How to tell

When to call a technician

If you've tried a good adapter, a fresh cable and a cooler spot and it still charges slowly, the port may need cleaning or replacing, or the battery may be worn. Woman Wireless On The Go can diagnose it and do the charging port repair or battery replacement at your home or workplace anywhere in our service area. You'll get a free quote first, and your technician confirms timing when she quotes. Call or WhatsApp (365) 351-4247, or book online.

Frequently asked questions

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