Phone charging slowly: causes ranked by likelihood
Is your phone charging slower than usual? While it might feel like a battery issue, the problem often lies elsewhere. Here’s a step-by-step guide to diagnose and fix slow charging, ranked by how likely each cause is to be the culprit.
Key Takeaways
- Start with the simplest fixes: check the cable and adapter first.
- Heat and dirt can significantly slow down charging speeds.
- Battery health matters, but it’s usually not the first thing to worry about.
- Some charging behaviors, like overnight charging, are managed by your phone to protect the battery.
- Replacing parts or adjusting settings can often resolve the issue without needing a new phone.
1. The charging cable is the most likely culprit
The charging cable is the most common reason for slow charging. A damaged or low-quality cable can drastically reduce the power your phone receives, even if you’re using a fast charger. If your cable is frayed, thin, or more than a couple of years old, it’s time for a replacement. Try a high-quality USB-C cable and see if that makes a difference. If charging speeds up, you’ve found the problem.
2. Your adapter might not be up to the task
Fast charging requires a compatible fast charger. If you’re using an old 5W adapter, charging through a PC’s USB port, or relying on a car charger, you’re not getting the fastest speeds possible. For optimal charging, use a USB-C Power Delivery (PD) adapter that delivers at least 18–20W, matching your phone’s supported wattage. Charging from a wall outlet with a proper adapter is always faster than using a laptop or a hub.
What if I don’t have the original adapter?
Don’t worry. A good-quality PD charger from a reputable brand will work just fine, and it might even be better than the one that came with your device. Just make sure it’s rated for the right wattage.
3. A dirty or loose charging port can cause issues
Pocket lint and debris can accumulate in your phone’s charging port, preventing a solid connection. This is a surprisingly common reason for slow or intermittent charging. To fix this, power off your phone and gently clean the port with a dry wooden or plastic toothpick (avoid using metal to prevent damage). Follow up with a short burst of compressed air to remove any remaining debris. If the cable feels loose or wobbly in the port, this could be the issue.
4. Heat can trigger your phone’s protective measures
Phones are designed to slow down charging when they get too warm. This is a protective measure to prevent battery damage. If your phone feels hot—perhaps it’s in direct sunlight, under a pillow, or inside a thick case while you’re gaming—it will charge more slowly. To help your phone cool down, remove the case, move it to a cooler location, and avoid using it while it’s charging.
5. Battery-protection settings might be limiting charging
Features like Optimised Battery Charging on iPhones and Adaptive Charging on Android devices are designed to extend battery life. These features intentionally slow down charging, often capping it at 80% overnight and finishing the charge just before your alarm goes off. This isn’t a malfunction; it’s a feature to protect your battery’s longevity. If you need a quick charge, you can pause these features in your battery settings.
6. Background tasks and screen usage affect charging speed
Charging while running demanding apps, navigating with GPS, or keeping the screen brightness high can slow down charging. This is because the power is being used up as quickly as it’s coming in. For faster charging, try to charge with the screen off and avoid heavy usage during the process.
When it’s the battery (hardware)
If none of the above solutions work and your phone is three or more years old, the battery might be the issue. As batteries age, their capacity diminishes, which affects both how long they hold a charge and how quickly they recharge. You can check your battery’s health in the settings menu. If the capacity is below 80%, it might be time for a replacement. A battery replacement is a cost-effective repair if your phone still receives security updates. Check your device’s support status in our support tracker before deciding on a replacement.
Frequently Asked Questions
Does charging overnight damage the battery?
Modern phones are designed to handle overnight charging well. Features like Optimised Battery Charging are specifically in place to prevent the battery from staying at 100% all night. It’s generally safe to charge your phone overnight. However, for long-term battery health, it’s best to keep the battery level between 20–80% as much as possible.
Is wireless charging slower?
Yes, wireless charging is usually slower than wired charging. Additionally, if the phone isn’t properly aligned on the charging pad, it can slow down even more or stop charging altogether. For the fastest charging speeds, use a cable. If you prefer the convenience of wireless charging, make sure the phone is centred on the pad.
Should I use the charger that came with another device?
Using a good-quality PD charger from a reputable brand is usually fine and can often be better than an older charger that came with your device. Just make sure the charger is rated for the appropriate wattage to match your phone’s requirements.
Can I use a third-party cable?
Yes, but make sure it’s a high-quality cable from a reputable brand. Poor-quality cables can cause slow charging or even damage your device. Look for cables that are certified for fast charging.
What if my phone still charges slowly after trying all these steps?
If you’ve tried all the troubleshooting steps and your phone is still charging slowly, it might be time to consider a battery replacement or, in some cases, a new phone. If your phone is older and no longer receives updates, it might be more cost-effective to upgrade.