Samsung Galaxy S25 Ultra Super Fast Charging: All You Need to Know

Samsung first introduced Super Fast Charging with the Galaxy Note 10+ (2019) using USB Power Delivery 3.0 (PPS) to enable 45W charging. It improves efficiency by dynamically adjusting voltage and current based on battery conditions, reducing heat and extending lifespan.

Compared to normal charging, which is typically 15W or lower and uses a fixed voltage, Super Fast Charging is faster and more efficient. It can charge a phone to 50% in about 20 minutes, while normal charging takes significantly longer.

The feature has since been included in flagship Galaxy S and Note series devices, though Samsung has stuck to a 45W limit for battery longevity.

In this guide, we’ll understand how the Samsung Galaxy smartphone's Super Fast Charging protocol works and how to use it on your S25 Ultra. We’ll also uncover user-reported issues about the super fast charging performance and ways to fix them (should you encounter one).

The Samsung Galaxy S25 Ultra supports Super Fast Charging 2.0, a high-speed wired charging technology that delivers up to 45W of power when used with a compatible charger and cable. It uses a PPS (Programmable Power Supply) technology– a USB Power Delivery (USB-PD) standard that dynamically adjusts voltage and current based on the phone’s needs.

The Galaxy S25 series super fast charging supports 45W charging via USB PD 3.0 & PPS. Here’s how it works:

• The S25 Ultra’s battery draws up to 15V/3A or 10V/4.5A using a Samsung-certified 45W charger and 5A-rated USB-C cable.

• Charging speed slows down as the battery fills up to prevent overheating and extend battery health.

Moreover, the Galaxy S25 Ultra also utilizes intelligent charging management. The device manages charging speed dynamically based on:

• Battery temperature (slows down if too hot)

• Current charge level (fast up to ~50%, then gradually slows)

• Charger & cable quality (may default to lower wattage if not compatible)

To enable and use Super Fast Charging 2.0 on your Samsung Galaxy S25 Ultra, follow these easy steps.

Step 1: Use Compatible Accessories 

Here are the things you’ll need to supercharge your Galaxy S25 Ultra.

✔ Samsung 45W Super Fast Charger (USB PD 3.0 PPS)

✔ Samsung 5A USB-C to USB-C Cable

✔ Plug into a stable power outlet (avoid extension cords with power fluctuations)

Step 2: Enable Super Fast Charging in Settings 

You still need to turn on the fast charging feature on your Samsung Galaxy device. To do this:

1. Open Settings.

2. Tap Battery and device care.

3. Tap Battery.

4. Tap More battery settings.

5. Make sure Super Fast Charging is turned on.

 Step 3: Plug In and Check Charging Speed 

When correctly set up, your phone should show:

• “Super Fast Charging 2.0” on the lock screen

• Estimated full charge time (~50-60 minutes for 0-100%)

No, 45W is the maximum wired charging speed supported. Some competitors (like OnePlus and Xiaomi) offer 100W+ charging, but Samsung prioritizes battery longevity over extreme speeds.

There have been user-reported issues related to the super fast charging performance of the S25 Ultra and S25+ models. Users have noted inconsistencies, such as slower-than-expected charging speeds and frequent disconnection and reconnection during charging sessions. These problems often arise when using 5-ampere (5A) USB-C cables with 45W chargers, devices that previously functioned correctly with earlier Galaxy models. In some instances, despite the device indicating “Super Fast Charging 2.0” on the lock screen, a full charge requires several hours.

Samsung Italia has acknowledged these issues, attributing them to the use of 5A cables, and has announced that a software update is in development to address the problem. In the meantime, we dug into tips and tricks to fix the Samsung Galaxy S25 Ultra super fast charging problem.

In the interim, users are advised to switch to 3A USB-C cables with their 45W chargers, as the Galaxy S25 Ultra supports a 15V/3A charging profile. This configuration should maintain optimal charging speeds without necessitating a 5A cable. Alternatively, disabling the Super Fast Charging feature in the device settings may stabilize charging, albeit at reduced speeds.

It’s important to note that these issues are specific to wired charging on the S25+ and S25 Ultra models; the base Galaxy S25 model, which supports 25W charging, and wireless charging functionalities remain unaffected.

If you’re experiencing super-fast charging issues with the Samsung Galaxy S25 Ultra or S25+, here are several fixes based on Samsung Italia’s recommendations and user reports.

1. Use a 3A USB-C Cable Instead of a 5A Cable 

The Galaxy S25 Ultra supports a 15V/3A charging profile, meaning a 3A USB-C cable is the best choice for stable charging.

Users have reported that 5A cables cause charging disruptions, including slow speeds and frequent reconnections.

If you’re using an older 5A cable, switch to a Samsung-certified 3A USB-C cable or another high-quality alternative.

2. Disable “Super Fast Charging” in Settings 

If charging remains unstable, try this fix:

1. Go to: Settings → Battery and device care → Battery

2. Tap More battery settings

3. Turn off “Super Fast Charging”

This will reduce the charging speed but may prevent disconnection issues.

3. Use a Certified 45W Charger 

Ensure you are using a Samsung-certified 45W charger (or a third-party charger that supports Super Fast Charging 2.0). Using a lower-quality charger may result in inconsistent charging performance.

4. Wait for Samsung’s Software Update 

Fortunately, Samsung has acknowledged the fast charging issue and is working on a fix. Once the update is released, install it via: Settings → Software update → Download and install.

5. Check for Hardware Issues 

If your S25 Ultra still has issues after following these steps, test with a different charger, cable, and power outlet. If charging problems persist, contact Samsung support for further assistance.

Yes! Besides the official fixes, here are some extra workarounds you can try to improve Super Fast Charging on the Galaxy S25 Ultra and S25+.

 1. Try a Different Power Adapter (Lower Wattage) 

If 45W charging is unstable, try a 25W Samsung charger instead. The S25 Ultra and S25+ are backward compatible with 25W charging, which might charge more consistently without the disconnection issue.

This fix isn’t ideal for speed, but it's better than random charging interruptions.

 2. Use a High-Quality Third-Party USB-C Cable 

If you still prefer Super Fast Charging 2.0, try a premium 3A or 5A USB-C cable from brands like:

• Anker

• Belkin

• UGREEN

• Baseus

Some Samsung-certified cables might have compatibility issues with certain chargers, so testing a high-quality third-party cable could help.

 3. Switch Power Outlets or Use a Surge Protector 

Faulty power outlets or unstable electricity can cause charging interruptions. If possible, plug the charger into a different wall socket, a high-quality surge protector, or a UPS (Uninterruptible Power Supply) if you suspect power fluctuations.

 4. Charge While the Phone is in Airplane Mode 

Try this technique if background activity is interfering with charging. Enabling Airplane Mode while charging reduces power consumption and might help stabilize charging speeds.

 5. Keep the Device Cool 

Heat buildup can cause Samsung devices to throttle charging speeds. To prevent this:

• Charge in a cool, well-ventilated area.

• Remove the case (especially thick leather or silicone cases).

• Avoid charging while gaming or using power-hungry apps.

 6. Use a Wireless Charger (as a Temporary Solution) 

Since this issue only affects wired charging, you can use a wireless charger in the meantime. The S25 Ultra supports 15W wireless charging, which is slower but consistent and stable.

 Final Alternative: Factory Reset (Last Resort) 

If all else fails, try a factory reset to rule out software conflicts: Settings → General management → Reset → Factory data reset

Back up your data first before doing this.

The Samsung Galaxy S25 Ultra’s Super Fast Charging 2.0 provides a quick and efficient way to power up your device, reaching 50% in just 20 minutes when using the right accessories. However, some users have reported inconsistent charging speeds, which Samsung is working to fix via a software update.

For now, using a Samsung-certified 3A USB-C cable, checking your charger compatibility, and keeping your device cool can help stabilize charging performance. If issues persist, switching to a 25W charger or using wireless charging may serve as temporary solutions. Keep an eye out for Samsung’s firmware update to resolve any lingering charging problems.