Why Is My Phone Charging So Slowly (or Not at All)? A Step-by-Step Fix

You plug your phone in before bed, and in the morning it's barely above 20 percent. Or it says it's charging, but the number crawls upward. Or nothing happens at all. It's frustrating, but the cause is usually something small and cheap to fix. The steps below go in order, starting with the quickest and most common.

First, what's actually happening when a phone charges?

Charging is a chain of four parts: the wall outlet, the power brick (the plug-in block, also called the adapter), the cable, and your phone's charging port. Your phone also talks to the charger and tells it how much power it can accept. If any link is weak, worn, or dirty, the whole chain slows down or stops. That's good news, because most links cost very little to replace.

Step 1: Try a different outlet and a different cable

Cables are the most common culprit. The thin wires inside bend and fray over time, especially near the ends, even when the outside looks fine. Borrow a cable you know works, or try another one from around the house. Also test a different wall outlet, since a loose or switched-off outlet can look exactly like a broken phone. If the new cable works, throw the old one away and buy a replacement from a reputable brand.

Step 2: Check the power brick

Not all power bricks are equal. An old brick that came with a much older phone, or a small one meant for earbuds, may only deliver a trickle of power. Power is measured in watts, and the number is usually printed in tiny type on the brick. A higher number means faster charging, as long as your phone supports it. Plugging into a computer's USB port or a car's older USB socket is also slow, because those offer far less power than a wall adapter. For everyday charging, use a wall adapter from your phone's maker or a well-known brand.

Step 3: Clean out the charging port

Pockets and purses are full of lint and dust, and it packs into the charging port a little more every day. Eventually the plug can't seat all the way in, so it touches only some of the connectors. If the cable feels loose or has to be wiggled to start charging, this is probably the problem.

Turn the phone off first. Then shine a flashlight into the port and gently scrape out any debris with a wooden or plastic toothpick. Don't use metal, such as a paperclip or pin, because it can damage the tiny connectors inside or cause a short. Don't spray liquids into the port either. A puff of canned air from a few inches away can help, but be gentle.

Step 4: Restart the phone

Sometimes the phone's software, not the hardware, is confused about whether a charger is connected. Turning the phone completely off and back on clears up many of these glitches. If the battery is totally dead, leave it plugged in for at least 15 to 30 minutes before deciding it's broken. A deeply drained battery can take a while to show any sign of life.

Step 5: Look for things that slow charging on purpose

Modern phones deliberately slow down when conditions aren't right. A phone that gets hot, from sitting in the sun, a thick case, or heavy use while charging, will cut its charging speed to protect the battery. Move it somewhere cool, take off the case, and stop playing games or streaming video while it charges.

Many phones also have an optional setting that pauses charging at around 80 percent overnight, then finishes just before you wake up. This extends the battery's lifespan, and it is normal, not a fault. On an iPhone, look for Optimized Battery Charging in Settings under Battery. On many Android phones, look in the battery settings for a similar option, often called adaptive or protected charging.

Step 6: Check the battery's health

Batteries wear out. After a few years of daily use, they hold less charge and can behave oddly. iPhones show a Maximum Capacity percentage in Settings under Battery, then Battery Health. Many Android phones have a similar screen, though its location varies by brand. If your number is well below 80 percent, a battery replacement from the maker or a trusted repair shop is often much cheaper than a new phone.

Quick answers to common questions

Is it okay to use a cheap gas-station cable?

It's a gamble. Poorly made cables can charge slowly and, in rare cases, be unsafe. Look for cables from known brands, or ones that carry a certification such as Apple's MFi label for iPhones.

Does wireless charging take longer?

Usually, yes. Wireless pads waste some energy as heat, and they work best when the phone sits perfectly centered. If wireless charging seems sluggish, try a cable for comparison.

Should I leave my phone plugged in all night?

Yes, that's fine. Modern phones stop drawing power when full, and the built-in battery-protection settings help further.

When to get help

If a known-good cable and charger, a cleaned port, and a restart still don't help, the port or battery itself may need repair. Stop using the phone if the battery looks swollen, the back is bulging, or the phone gets very hot or smells odd. Those are signs of a failing battery, and it should be looked at by the manufacturer or a qualified repair shop right away. Otherwise, start with the cheap fixes at the top of this list. More often than not, a new cable is all it takes.