Phone Charging Slowly? 9 Fixes to Speed It Up (Android & iPhone)
You plug in your phone, come back an hour later, and it has only gained 15%. Slow charging is one of the most annoying phone problems, and it is rarely the battery’s fault. More often it is a bad cable, a dirty port, a setting that is off, or a charger that cannot deliver enough power. The good news is that almost every cause is easy to diagnose and fix. Here are nine fixes that work on both Android and iPhone.
9 fixes to speed up charging
1. Check your cable and charger first. This is the most common culprit and the easiest to fix. Cheap or frayed cables cannot carry the full current, and a weak charger will trickle power in no matter what cable you use. For fast charging, you need both a fast charger (the brick that plugs into the wall) and a cable rated for it. Try swapping in a different cable and a different charger — if the phone suddenly charges fast, you found the problem. Look for Power Delivery (PD) chargers for iPhone and recent Android phones, and make sure the cable is USB-IF certified or from a reputable brand like Anker, not a no-name one.
2. Clean the charging port. Pocket lint and dust build up inside the charging port over months, compressing into a solid felt-like plug that prevents the cable from seating fully. This is extremely common and almost always misdiagnosed as a bad battery. Power the phone off, grab a wooden or plastic toothpick (never metal), and gently dig out the lint from the bottom of the port. Shine a flashlight in there first — you will probably see a grayish wad of compacted dust. Once removed, the cable will click in properly and fast charging will often resume instantly. Do this every few months as prevention.
3. Make sure fast charging is actually enabled. Both Android and iPhone have settings that can disable fast charging, and sometimes they get turned off without you noticing. On Android, go to Settings > Battery > Charging (or “More battery settings”) and look for “Fast charging,” “Super fast charging,” or “Boost charging” — toggle them on. Some phones also have a “Protect battery” or “Battery health” option that caps charging at 85% and slows it down; disable it temporarily if you need a quick top-up. On iPhone, fast charging requires a 20W+ USB-C PD charger and a USB-C to Lightning cable (or USB-C cable on iPhone 15 and newer) — there is no toggle, but if you use an old 5W charger it will charge at snail pace by design.
4. Turn on airplane mode while charging. When your phone is searching for signal — especially in a weak-coverage area — the cellular radio burns power almost as fast as the charger can deliver it. Airplane mode shuts off cellular, Wi-Fi, and Bluetooth, so nearly all incoming power goes into the battery instead of powering radios. You can easily double your charging speed this way. If you need to stay reachable, just toggle off mobile data instead of full airplane mode — that still helps a lot.
5. Turn the phone off completely while charging. This is the nuclear option for the fastest possible charge. With the screen, CPU, and radios all off, every watt goes straight into the battery. A phone that takes two hours to charge while on can often hit 100% in 45 minutes when powered off. You do not have to do this every time, but if you need a quick top-up before heading out, five minutes of powered-off charging can give you more juice than twenty minutes with the phone on.
6. Close background apps and stop using it while charging. Using the phone while it charges — especially gaming or video recording — means the screen and CPU are consuming power at the same time the charger is trying to fill the battery. The net charge rate drops dramatically. Swipe away your recent apps, let the screen turn off, and leave it alone. If you must use it, stick to light tasks like texting and avoid anything that makes the phone warm. Heat is the enemy of fast charging (more on that below).
7. Check your battery health. All lithium-ion batteries degrade over time, and an old battery simply cannot accept a fast charge anymore. On iPhone, go to Settings > Battery > Battery Health & Charging — if “Maximum Capacity” is below 80%, the battery is worn and charging will be slower and the runtime shorter. On Android, install the free app AccuBattery and let it run for a few charge cycles to estimate your battery health; most Samsung and Xiaomi phones also show battery health in Settings > Battery. If health is below 80%, a battery replacement will restore both charging speed and battery life.
8. Use wired charging instead of wireless. Wireless charging is convenient but slow and inefficient. Even the fastest wireless chargers top out around 15–50W, while wired fast charging on many Android phones goes up to 65W, 100W, or even 240W — meaning a full charge in 10 to 20 minutes. If you are in a hurry, always plug in with a cable. Wireless charging also generates more heat, which triggers the phone’s thermal protection and slows the charge further. Reserve wireless for overnight charging when speed does not matter.
9. Keep the phone cool while charging. Heat is the single biggest throttle on charging speed. When the battery gets warm, the phone deliberately slows charging to protect the cells. Never charge under a pillow or blanket, avoid charging in direct sunlight or in a hot car, and remove thick cases during fast charging — they trap heat. If your phone feels hot to the touch while charging, unplug it, let it cool down for ten minutes, then plug it back in. You will notice the charge rate jump immediately.
Frequently asked questions
Why does my phone charge fast up to 80% then slow down? This is intentional and good for your battery. Fast charging puts stress on lithium-ion cells, so all modern phones slow to a trickle (called “trickle charging” or “battery conditioning”) once they hit roughly 80% to extend battery lifespan. It is not a bug — it is a feature.
Does using my phone while charging damage the battery? No, it does not damage the battery, but it makes charging slower and generates more heat. Occasional use while charging is fine. Just avoid gaming or video recording while plugged in for long stretches, since the extra heat can degrade the battery faster over time.
How many watts do I need for fast charging? For iPhone, a 20W USB-C Power Delivery charger is enough to hit fast charging. For Android, match the wattage to what your phone supports — check the box or the manufacturer’s website. A higher-watt charger will not hurt your phone (it negotiates the right speed), but it also will not charge faster than the phone’s maximum supported rate.
Should I worry about overnight charging? Modern phones are smart enough to stop charging at 100% and trickle-top throughout the night, so overnight charging is safe. Enabling “optimized battery charging” (iPhone) or “protect battery” (Android) makes it even gentler by holding at 80% until right before you wake up.