You plug your phone in before bed and wake up to 54%. If you have been asking yourself why is my phone charging slowly, you are not alone. The slow phone charging fix is almost always one of a handful of things, and most are easy to sort. Here is what is actually going on, what causes it, and how to fix slow phone charging for good.
The number one reason why is my phone charging slowly comes down to a mismatched charger. Most phones ship with a 5W or 10W brick in the box. If you are trying to get from 20% to 80% in under an hour, a 5W charger will not cut it. A modern Android flagship or iPhone 15 can accept 20W, 30W, or even more. Feed it a 5W charger and it will trickle in at around 1A or less, which translates to roughly 5 watts of actual power delivered to the battery.
The slow phone charging fix here is straightforward: match your charger to your phone’s fast charging specification. Samsung Galaxy S-series phones need at least 18W for fast charging, with the S23 Ultra accepting up to 45W. iPhone 8 and later support USB Power Delivery and can handle 20W to 27W depending on the model. Some Android flagships, including recent Google Pixel and OnePlus models, accept 65W or higher. Check your phone’s spec sheet and match the charger wattage to it.
A 30W GaN (Gallium Nitride) charger is a solid all-rounder for most people. GaN chargers run cooler and more efficiently than older silicon-based bricks, and they are compact enough to travel with. If you are using anything that shipped before 2018 and still wondering why is my phone charging slowly, start here.
People buy cables based on price and looks, which is why so many end up searching for a slow phone charging fix six months later.
A cheap, unrated USB-C cable may only carry 0.9A regardless of what your charger is rated for. The connector might look identical, but internally the wire gauge is too thin to support high current. <a href=”https://www.usb.org/usb-charger-pd” target=”_new”>USB-IF certified cables</a> are independently rated and tested for the current they claim to carry. Non-certified cables often are not, and many will throttle back to safe lower current levels automatically. That throttling is exactly why is my phone charging slowly in those setups.
A USB-C to USB-C cable rated for 60W carries 3A at 20V. A 100W-rated cable supports up to 5A. Pair a 60W-rated cable with a 30W GaN charger and you will see a genuine difference versus a random USB-C cable from a two-pack. A quality cable delivers consistent current without the connector degrading after months of daily use.
If you are still using a USB-A to Lightning cable with the original 5W brick, you are capped at around 5W regardless of anything else. Switching to a USB-C to Lightning cable with a 20W PD charger is the simplest slow phone charging fix for most iPhone users. That single swap takes charge time from 2 plus hours down to around 1 hour 15 minutes for a full charge on an iPhone 14.
This question comes up constantly. If you are asking why does my iPhone charge slowly on a wall charger, the answer is almost always the same: the wall charger is too low-wattage, the cable does not support Power Delivery, or both.
Check the wattage printed on the brick itself. If it says 5W, that is your problem. iPhones from the iPhone 8 onwards support USB-PD fast charging, but only with a 20W or higher charger and a compatible USB-C to Lightning or USB-C to USB-C cable (for iPhone 15 and later). A 20W PD charger gets an iPhone from 0% to around 50% in 30 minutes. The old 5W brick takes over two hours for the same result. That is a fourfold difference in charging speed from one charger swap.
Socket proximity is another factor. Charging through an extension lead with multiple devices running on the same circuit can sometimes cause voltage drop at the socket. Plug directly into a wall outlet where possible for maximum charging speed.
If your charger and cable check out, look at the phone itself. Running navigation, streaming video, or downloading a large app update while charging forces the battery to compete with active power draw. Your phone charges slowly in that scenario because it is spending power as fast as it is pulling it in. On a 20W charger, heavy screen use can absorb 8W to 12W of that, leaving only 8W to 12W actually going into the battery.
Battery health plays a role too. iOS shows this under Settings, then Battery, then Battery Health and Charging. Once battery health drops below 80%, the phone’s charge management software limits charge acceptance to protect the degraded cells. That is not a slow phone charging fix you can buy your way out of. It does explain, though, why an older phone charges slower than it used to even with a new charger. A battery replacement is the real fix in that case.
Low Power Mode on iPhone throttles background activity including mail fetch, visual effects, and CPU performance. Enabling it while charging can noticeably speed up charging time by reducing active power draw. Android phones have a similar Battery Saver mode with the same effect.
Wireless charging is another factor. While convenient, Qi wireless charging maxes out at around 5W to 15W depending on your phone and pad, compared to 20W to 45W or more with a wired connection. If you are on a wireless pad and asking why is my phone charging slowly overnight, that is the ceiling of wireless speeds. Switching to a wired connection is the most effective slow phone charging fix in that situation.
USB-A ports on computers output 0.5A to 0.9A as standard. That is around 2.5W to 4.5W total, barely enough to keep pace with screen-on use. A phone actively in use while plugged into a USB-A port may not gain any charge at all. If you are relying on a hub or laptop port and asking why is my phone charging slowly, that is your answer.
USB-C ports on modern laptops are better. Some deliver up to 15W through the port itself, and some laptops support USB-PD output which can deliver 20W or more to a connected device. But even the best laptop USB-C port is typically slower than a dedicated wall charger. A 20W to 30W wall charger beats a laptop port in every practical test.
USB hubs add another layer of limitation. A bus-powered USB hub shares power from a single laptop port across all connected devices. Split 4.5W between a phone, a mouse, and a keyboard dongle and you are delivering very little to the battery. A slow phone charging fix in this situation is simple: use a wall charger instead.
Heat slows charging. Most smartphones have a temperature ceiling above which the charge management IC will throttle incoming current to protect battery cells. On iPhone, you will see a Temperature warning message if it gets too hot. On Android, the battery management system does the same thing silently, with no visible notification.
Direct sunlight, charging inside a thick case, or placing the phone on a soft surface like a bed or couch that traps heat underneath are all common reasons why is my phone charging slowly, especially in summer. Remove the case, charge on a hard flat surface, and keep the phone out of direct sunlight. This will not transform a 5W charger into a 30W one, but it removes a bottleneck that makes slow charging even slower.
Cold temperatures also affect charging. Below about 10 degrees Celsius, lithium-ion batteries accept charge more slowly by design. Charging a phone that has been sitting in a cold car during a Melbourne winter will start slower until the battery temperature rises to a normal operating range. That is normal battery chemistry, not a hardware fault. The slow phone charging fix is simply to warm the device up before plugging in.
Run through these before spending anything:
Most of the time, the slow phone charging fix comes down to steps 1 and 2. A better charger and a quality cable cover the majority of situations. Everything else on that list is a secondary adjustment that removes additional drag from the charging process.
If you have worked through that list and are still asking why is my phone charging slowly, the charger and cable are almost certainly the issue. Upgrading to a 30W GaN charger paired with a rated USB-C cable is the most reliable slow phone charging fix available, and you will notice the improvement from the very first charge. Match the wattage to your phone’s spec, use a certified cable, and charge from a wall outlet. That is the complete slow phone charging fix, and it works every time.
Browse fast chargers and USB-C cables at coreconnectaust.com.au. Locally stocked in Melbourne, same-day shipping on orders before 10am.
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