How to Charge Eufy S1 Breast Pump

Charging your Eufy S1 breast pump correctly ensures reliable performance and longer battery life. This guide walks you through the process, from connecting the cable to troubleshooting common issues.

Key Takeaways

• Use only the official Eufy charging cable and adapter: Third-party chargers may damage the pump or reduce battery efficiency.
• Charge for at least 2 hours for a full battery: A complete charge supports up to 3 hours of pumping on a single cycle.
• Look for the LED indicator light: A solid white light means charging; blinking indicates an issue or low battery.
• Avoid charging during pumping sessions: Always charge when the pump is off to protect the motor and battery.
• Store the pump in a cool, dry place when not in use: Heat and moisture can degrade battery performance over time.
• Clean the charging port gently: Dust or milk residue can interfere with charging—use a dry cotton swab.
• Contact Eufy support if charging fails: Persistent issues may indicate a hardware problem covered under warranty.

How to Charge Eufy S1 Breast Pump

If you’re a new mom using the Eufy S1 breast pump, one of the most important things you’ll need to master is how to charge it properly. The Eufy S1 is a portable, rechargeable electric breast pump designed for comfort, efficiency, and convenience. But like any electronic device, it needs regular charging to keep working at its best. Whether you’re pumping at home, at work, or on the go, knowing how to charge your Eufy S1 correctly ensures you never miss a session due to a dead battery.

In this comprehensive guide, we’ll walk you through every step of charging your Eufy S1 breast pump—from identifying the right charger to troubleshooting common issues. You’ll learn how long it takes to charge, how to tell when it’s fully powered, and how to maintain the battery for long-term use. We’ll also share practical tips to help you get the most out of your pump and avoid common mistakes that can shorten its lifespan.

By the end of this guide, you’ll feel confident handling your Eufy S1’s charging needs, whether you’re a first-time user or just need a refresher. Let’s get started!

What You’ll Need to Charge Your Eufy S1

Before you begin charging your Eufy S1 breast pump, it’s important to gather the right tools. Using the correct equipment not only ensures a safe charge but also protects your pump from damage.

Official Eufy Charging Cable and Adapter

The Eufy S1 comes with a dedicated USB-C charging cable and a wall adapter. Always use this original equipment manufacturer (OEM) charger. Third-party cables or adapters may not deliver the correct voltage or current, which can lead to slow charging, overheating, or even permanent damage to the pump’s internal battery.

If you’ve misplaced your original charger, contact Eufy customer support to order a replacement. Avoid using random USB-C cables from other devices—even if they fit, they may not be compatible.

Power Source

You can charge your Eufy S1 using any standard USB power source. This includes:

• A wall outlet (using the included adapter)
• A computer USB port
• A portable power bank
• A car USB charger (with proper voltage output)

For the fastest and most reliable charge, we recommend using the wall adapter plugged into a stable outlet. Charging via a computer or low-power USB port may take significantly longer.

Clean, Dry Environment

Make sure the area where you’re charging your pump is clean and dry. Avoid charging near sinks, in humid bathrooms, or in areas where liquids could spill. Moisture can damage the charging port or cause electrical issues.

Also, ensure the pump itself is dry before plugging it in. If you’ve just washed the pump parts, let them air dry completely before reassembling and charging.

Step-by-Step Guide to Charging Your Eufy S1

Now that you have everything you need, let’s go through the charging process step by step. Follow these instructions carefully to ensure a safe and effective charge every time.

Step 1: Turn Off the Pump

Before connecting the charger, make sure the Eufy S1 is turned off. Do not charge the pump while it’s running or in standby mode. Charging during operation can overheat the motor and strain the battery.

To turn off the pump, press and hold the power button for 3 seconds until the screen turns off. You’ll see the LED indicator light go out.

Step 2: Locate the Charging Port

The charging port on the Eufy S1 is located on the side of the motor unit. It’s a small, rectangular USB-C port, usually covered by a soft silicone flap to protect it from dust and moisture.

Gently lift the flap to expose the port. Be careful not to tear or damage the flap—it’s designed to keep the port clean.

Step 3: Connect the Charging Cable

Take the USB-C end of the Eufy charging cable and insert it into the charging port. The USB-C connector is reversible, so it will fit either way—no need to worry about orientation.

Push the cable in gently until it clicks into place. Do not force it. If it doesn’t go in smoothly, double-check that you’re using the correct cable and that the port is clean.

Step 4: Plug Into a Power Source

Now, connect the other end of the cable to your power source:

• If using the wall adapter, plug the USB-A end into the adapter, then plug the adapter into an outlet.
• If using a power bank or computer, plug the USB-A end directly into the device.

Once connected, the pump should begin charging immediately.

Step 5: Check the LED Indicator Light

The Eufy S1 has a small LED light near the charging port that shows the charging status:

• Solid white light: The pump is charging normally.
• Blinking white light: The battery is very low or there’s an issue with the connection.
• No light: The pump may be fully charged, or there could be a problem with the charger or port.

If the light is solid white, you’re good to go. If it’s blinking or off, check the troubleshooting section below.

Step 6: Wait for a Full Charge

The Eufy S1 takes approximately 2 hours to charge from 0% to 100%. You can use the pump while it’s charging, but we recommend waiting until it’s fully charged before starting a session—especially if the battery was completely drained.

A full charge provides up to 3 hours of continuous pumping, depending on the suction level and mode you use. This makes it ideal for multiple sessions throughout the day.

Step 7: Disconnect the Charger

Once the LED light turns off or remains solid (indicating a full charge), you can safely disconnect the cable. Gently pull the USB-C connector straight out—don’t yank it at an angle.

Close the silicone flap over the charging port to keep it protected.

Your Eufy S1 is now ready to use!

How Long Does It Take to Charge the Eufy S1?

One of the most common questions new users have is: “How long does it take to charge the Eufy S1?” The answer depends on the current battery level and the power source you’re using.

Standard Charging Time

Under normal conditions, the Eufy S1 takes about 2 hours to charge fully from empty. This is based on using the official Eufy wall adapter and a stable power source.

If you’re using a lower-powered USB port—like one on a laptop or a small power bank—it may take up to 3 hours or more. Always use the included adapter for the fastest charge.

Battery Life After Charging

Once fully charged, the Eufy S1 can run for up to 3 hours. This is based on moderate suction levels (around level 5–7). Higher suction settings will drain the battery faster.

For example:

• Low suction (levels 1–4): Up to 3 hours of use
• Medium suction (levels 5–7): About 2–2.5 hours
• High suction (levels 8–10): Around 1.5–2 hours

Keep this in mind when planning your pumping schedule. If you know you’ll need high suction for a long session, consider charging the pump beforehand.

Partial Charging Is Okay

You don’t always need to charge the pump to 100%. A 30-minute charge can give you about 30–45 minutes of pumping time, which may be enough for a quick session.

This is especially helpful if you’re in a hurry or forgot to charge it overnight. Just remember that frequent partial charges are fine—modern lithium-ion batteries (like the one in the Eufy S1) don’t suffer from “memory effect” like older battery types.

Tips for Maintaining Battery Health

To get the most out of your Eufy S1, it’s important to take care of its battery. With proper maintenance, the battery can last for hundreds of charge cycles—potentially several years of daily use.

Avoid Overcharging

While the Eufy S1 has built-in protection against overcharging, it’s still best to unplug it once it’s fully charged. Leaving it plugged in for extended periods (like days at a time) can generate excess heat and reduce long-term battery health.

A good rule of thumb: charge it when needed, and unplug it when done.

Don’t Let the Battery Die Completely

Try not to let the battery drain to 0% regularly. While occasional full discharges are harmless, doing it frequently can stress the battery. Aim to recharge when the battery drops to 20–30%.

The Eufy S1 will give you a low-battery warning—the LED will blink rapidly, and the screen may show a battery icon. Charge it as soon as you see this.

Store in a Cool, Dry Place

When not in use, store your Eufy S1 in a cool, dry place. Avoid leaving it in hot cars, near heaters, or in direct sunlight. High temperatures can degrade the battery over time.

If you’re storing the pump for more than a week, charge it to about 50% before putting it away. This helps preserve battery life during storage.

Clean the Charging Port Regularly

Dust, lint, or dried milk residue can build up in the charging port and interfere with charging. To clean it:

1. Turn off the pump and unplug it.
2. Use a dry cotton swab to gently wipe the inside of the port.
3. Do not use water, alcohol, or cleaning solutions—these can damage the electronics.
4. Let the port air dry completely before charging.

Cleaning the port every few weeks can prevent charging issues.

Update the Firmware (If Applicable)

Eufy occasionally releases firmware updates for the S1 pump that can improve performance and battery management. Check the Eufy app (if your model supports it) or the Eufy website for updates.

Keeping your pump updated ensures it runs efficiently and safely.

Troubleshooting Common Charging Issues

Even with proper care, you might run into charging problems from time to time. Here are some common issues and how to fix them.

The Pump Won’t Charge

If your Eufy S1 isn’t charging, try these steps:

1. Check the power source: Make sure the outlet, power bank, or USB port is working. Try plugging in another device to test.
2. Inspect the cable: Look for frayed wires, bent connectors, or damage. Try using a different USB-C cable (preferably the original).
3. Clean the charging port: Use a dry cotton swab to remove any debris.
4. Restart the pump: Turn it off, wait 10 seconds, then turn it back on and try charging again.
5. Try a different adapter: If possible, test with another 5V/2A USB adapter.

If none of these work, the battery or charging circuit may be faulty. Contact Eufy support.

LED Light Is Blinking

A blinking white light usually means the battery is very low or there’s a connection issue.

1. Ensure the cable is fully inserted into the port.
2. Try a different power source.
3. Wait 5–10 minutes—sometimes the pump needs a moment to recognize the charge.

If the light continues to blink after 30 minutes, the battery may need replacement.

Pump Gets Hot While Charging

Some warmth is normal during charging, but if the pump becomes hot to the touch, unplug it immediately.

Possible causes:

• Using a non-certified charger
• Charging in a hot environment
• Internal battery or motor issue

Let the pump cool down, then try charging with the official adapter in a cooler location. If overheating continues, stop using it and contact Eufy.

Battery Drains Quickly

If your pump runs out of power faster than expected:

• Check if you’re using high suction levels—these drain the battery faster.
• Ensure the pump is fully charged before use.
• Look for software updates that may improve efficiency.
• The battery may be aging—after 2–3 years of daily use, capacity can decrease.

If the battery no longer holds a charge, Eufy may offer a replacement under warranty.

Charging Port Feels Loose

If the USB-C port feels wobbly or the cable doesn’t stay in place, the port may be damaged.

Do not force the cable. Continued use could worsen the issue.

Contact Eufy support for repair or replacement options.

Best Practices for On-the-Go Charging

One of the biggest advantages of the Eufy S1 is its portability. But to keep it powered while traveling or at work, you’ll need a smart charging strategy.

Use a Portable Power Bank

A high-quality power bank with at least 10,000mAh capacity can charge your Eufy S1 once or even twice on the go. Look for one with a USB-A output and at least 2A current.

Keep the power bank in your pumping bag so it’s always ready.

Charge Overnight

Make it a habit to charge your pump every night. Even if the battery isn’t empty, topping it off ensures it’s ready for the next day.

Set a reminder on your phone if needed.

Keep a Backup Cable

Store an extra charging cable at work or in your diaper bag. This way, if you forget your main cable, you’re not stuck with a dead pump.

Avoid Charging in the Car Unless Necessary

Car USB ports often provide inconsistent power, which can lead to slow or failed charging. If you must charge in the car, use a high-quality car adapter with stable output.

Conclusion

Charging your Eufy S1 breast pump is simple, but doing it correctly makes a big difference in performance and longevity. By using the official charger, monitoring the LED light, and following best practices for battery care, you can ensure your pump is always ready when you need it.

Remember: charge for about 2 hours, avoid overcharging, keep the port clean, and store the pump properly. If you run into issues, try the troubleshooting steps or reach out to Eufy support.

With these tips, you’ll get the most out of your Eufy S1—whether you’re pumping at home, at work, or on the road. Happy pumping!