You plug your phone in before bed and wake up to 34%. Or the charging icon flickers on and off every time you nudge the cable. An Android phone that won’t charge, or charges painfully slowly, is one of the most common phone problems, and in most cases it’s caused by something simple: a worn cable, a dirty port, a weak adapter or a setting you didn’t know was switched on. This guide walks through the checks in the order most likely to find the fault, from the quick ones to the ones that mean it’s time for a repair.
What You’ll Need
- A second charging cable and a different wall adapter to test with, ideally the ones that came with the phone or a reputable brand
- A wooden or plastic toothpick (never metal) and a torch for checking the charging port
- About 15 minutes
Step 1: Rule Out the Cable and Adapter
Most charging problems are not the phone at all. USB-C cables wear out at the ends, especially if they’re bent at the plug or used while you’re lying in bed. Swap in a different cable first, then a different adapter, then a different socket. Change one thing at a time so you know which part was at fault.
Charging speed depends on all three working together. A small, old adapter or a laptop USB port can only supply a little power, so the phone may barely gain charge while you’re using it. If your phone supports fast charging, it only charges fast with a compatible adapter and cable; anything else falls back to slower standard charging.
Step 2: Clean the Charging Port Carefully
Pocket fluff builds up in the USB-C port over months and stops the cable going in all the way. A cable that feels loose, wobbles, or only charges at a certain angle is the classic sign.
- Turn the phone off.
- Shine a torch into the port and look for packed lint at the back.
- Gently loosen it with a wooden or plastic toothpick, working around the edges rather than pushing down on the centre contacts.
- Blow out loose debris, then try charging again.
Don’t use pins, paper clips or anything metal, and don’t spray liquids into the port. Both can short the contacts and turn a cheap fix into an expensive repair.
Step 3: Check for Moisture and Heat Warnings
Many Android phones, including most recent Samsung Galaxy models, stop wired charging if they detect moisture in the port and show a warning. If you see one, unplug the phone, dry the outside, and leave it to air-dry for a while before trying again. Wireless charging may still work in the meantime.
Phones also slow or pause charging when they get too hot, to protect the battery. If your phone is warm while charging, take it out of a thick case, stop gaming or streaming while it charges, and keep it off soft surfaces like beds and sofas. Our guide to fixing a phone that keeps overheating covers this in more detail.
Step 4: Look for Battery Protection Settings
If your phone always stops at around 80 to 85%, it might not be broken. Many manufacturers now include a battery-protection or adaptive charging feature that deliberately limits or delays charging to reduce battery wear. The name and location vary by brand, but you’ll usually find it in Settings under Battery (or Battery and device care on Samsung). Turn it off if you’d rather charge to 100%, though leaving it on is better for long-term battery health.
Step 5: Restart and Test in Safe Mode
A simple restart clears temporary glitches in the charging software. If charging is still unreliable, start the phone in Safe Mode, which temporarily disables third-party apps. On most phones you press and hold the power-off option on screen until Safe Mode appears. If the phone charges normally in Safe Mode, an app you installed (often a “battery saver” or cleaner app) is interfering. Restart normally and remove recently installed apps one at a time.
Step 6: Check Battery Usage and Update the Phone
If the phone charges but the battery drains almost as fast, the problem may be an app using power in the background. Open Settings > Battery and look at usage since the last full charge. Anything unexpected near the top is worth restricting or uninstalling. Then check Settings > System (or Software update) and install any available update, as manufacturers regularly fix charging and battery bugs.
Common Problems and Fixes
Charging stops and starts repeatedly
This nearly always points to the cable or port. Try a new cable and clean the port. If it still happens with several cables, the port itself may be worn and need replacing.
Wireless charging doesn’t work
Remove thick cases, metal plates or card holders, and line the phone up with the centre of the pad. Some pads need a specific adapter to work at full speed, so check the pad’s instructions.
The phone shows charging but the percentage doesn’t go up
The phone may be using more power than the charger supplies. Turn the screen off and leave it alone for 30 minutes on a wall adapter. If it still doesn’t rise, the battery may be worn out.
Safety: When to Stop and Get a Repair
- Stop using the phone if the back is lifting, the screen is being pushed out, or the phone is bulging. A swollen battery is a fire risk and should be replaced by a professional.
- Don’t use damaged cables with exposed wires or cracked plugs.
- Avoid very cheap unbranded chargers. Poorly made adapters can overheat and may not have proper safety protection.
- Back up your phone before handing it in for a battery or port repair, in case it needs to be reset.
FAQ
Why is my Android phone charging so slowly?
Usually because of a low-power adapter, a worn cable, using the phone while charging, or heat. Fast charging also needs a compatible adapter and cable.
Is it bad to charge my phone overnight?
Modern phones stop charging when full and many delay the last part of the charge until you wake up. Using the built-in battery protection features makes overnight charging gentler on the battery.
How do I know if my battery needs replacing?
Signs include very short battery life after a full charge, sudden shutdowns at 20–30%, and the phone getting hot when idle. Some phones show battery health in the Battery settings or the manufacturer’s support app.
If your phone charges fine but drains too quickly, see our guide to fixing fast battery drain. Google’s official Android battery help is also worth a look.
Steps and menu labels may change as apps update. Last updated: November 2026.