How to Fix Slow Wireless Charging on Your Phone

Published 2026-10-16 · Marion Phone Repair

Your phone charges wirelessly but it takes much longer than it should. A phone that charges in an hour and a half with a cable takes four or five hours on the wireless charging pad. Or the charging speed varies — sometimes it charges at a reasonable rate and other times it barely adds battery percentage over an hour. Slow wireless charging is caused by using the wrong power adapter, a case that reduces charging efficiency, heat buildup that triggers thermal throttling, a misaligned phone position, or a pad that does not support the fast wireless charging standard your phone uses.

Check the power adapter

The power adapter connected to the wireless charging pad is the most common cause of slow charging. The pad can only deliver what it receives:

Wattage requirement: Most wireless charging pads capable of fast charging require a Quick Charge 3.0, USB-PD, or high-wattage adapter. Using a basic 5V/1A or 5V/2A adapter limits the pad to standard speed charging (5W) regardless of the pad fast charging capability
iPhone fast wireless charging: iPhones support up to 7.5W wireless charging on standard Qi pads and up to 15W on MagSafe. To get 7.5W on a Qi pad, the adapter needs to supply at least 9V/2A. A 5V adapter limits iPhone wireless charging to about 5W
Samsung fast wireless charging: Samsung phones support up to 15W wireless charging. Samsung proprietary pads with 25W adapters deliver the fastest speeds. Using a non-Samsung adapter may limit speed to 5W or 10W
Pixel and other Android: Google Pixel phones support up to 23W on the Pixel Stand but only 12W on standard Qi pads. Other Android phones vary — check your phone specifications for the maximum wireless charging wattage and the adapter requirements to achieve it
Try the adapter that came with your phone (if it has a USB-A or USB-C output that matches the pad input) or buy an adapter specifically rated for your pad. The pad documentation or box should list the required adapter specifications

Remove or change the phone case

Even cases that do not completely block wireless charging can significantly slow it down. A thick case increases the distance between the coils, reducing power transfer efficiency. Every additional millimeter of distance can reduce charging speed noticeably
Remove the case and charge for 15 minutes. Check if the charging rate improves. If it does, the case is reducing efficiency
Cases with any metal (rings, plates, kickstands, embedded magnets not designed for wireless charging) drastically reduce charging speed because the metal absorbs the electromagnetic field energy as heat instead of letting it reach the phone coil
For the best balance of protection and charging speed, use a thin case (under 3mm) made of plastic or silicone with no metal components

Improve alignment

Even a slight misalignment between the phone and pad coils reduces charging speed. The coils need to be directly overlapping for maximum efficiency
Some pads have a small LED that changes color when alignment is optimal. Use this indicator to find the best position
MagSafe and Qi2 chargers with magnets eliminate alignment problems because the magnets snap the phone into the perfect position every time. If you frequently have alignment issues, a magnetic charger is the most reliable solution
On flat pads, place the phone face-up in the center. On angled stand chargers, rest the phone fully against the stand surface. An improperly seated phone on a stand charger can sit at an angle that misaligns the coils

Manage heat

Wireless charging generates heat as a byproduct of electromagnetic induction. When the phone or pad gets too warm, the charging system reduces power to prevent damage:

Remove the case while charging: The case traps heat around the phone, causing it to heat up faster and trigger thermal throttling sooner. Charging without a case allows the phone to dissipate heat through the glass back
Charge in a cool location: Avoid placing the charging pad in direct sunlight, near a heat source, or on surfaces that trap heat (fabric, pillow, blanket). A pad on a cool hard surface like a desk or nightstand charges faster because heat dissipates into the surface
Reduce phone use while charging: Using the phone while wirelessly charging adds heat from the display, processor, and modem on top of the charging heat. The combined heat causes aggressive thermal throttling. Put the phone down and let it charge
Night charging optimization: iPhones with Optimized Battery Charging and some Android phones intentionally slow charging overnight. The phone learns your schedule and charges slowly to 80 percent, only topping off to 100 percent right before your alarm. This is not a malfunction — it extends battery life by reducing time spent at 100 percent

Check fast wireless charging settings

Samsung

Settings, Battery and Device Care, Battery, More Battery Settings. Make sure Fast Wireless Charging is enabled. Samsung phones have this as a separate toggle — it may be off by default or may have been turned off to reduce fan noise on Samsung wireless charging pads

iPhone

There is no setting to enable or disable fast wireless charging on iPhone. The charging speed is determined automatically by the charger capability and thermal conditions. If the phone is charging slowly on a MagSafe charger, the issue is the adapter, temperature, or case — not a setting

Other Android

Some Android phones have a wireless charging speed setting or an optimized charging setting that limits speed. Check Settings, Battery for any charging-related options

Use a faster charging pad

Not all wireless charging pads support the same speeds. A pad rated for 5W will always charge slowly regardless of what adapter you use. Check the specifications printed on the pad or its packaging
For the fastest charging: use a pad rated for at least 10W with a QC 3.0 or USB-PD adapter for Android phones, or a MagSafe charger with a 20W USB-C adapter for iPhones
Multi-device pads that charge a phone, earbuds, and watch simultaneously often divide power between devices. Your phone may charge slower when other devices are also charging on the same pad

Compare wired vs wireless speed

Wireless charging is inherently slower than wired charging. Even the fastest wireless charging (15W to 25W on most phones) is slower than fast wired charging (20W to 100W+ depending on the phone). If you need fast charging, use a cable
The comparison should be fast wireless versus fast wireless — if your pad charged at 15W last month and now charges at 5W, something has changed. If it has always been slow, it may be operating at its normal speed and you are comparing to wired charging expectations

Wireless charging optimization in Marion

If your phone wireless charging is significantly slower than expected and the troubleshooting above did not improve it, Marion Phone Repair can test the wireless charging coil output, verify the charging pad functionality, check for internal phone issues affecting charging speed, and recommend the right charger and configuration for the fastest wireless charging your phone supports.