EcoFlow DeltaPro 3 Extra Battery Pack really allowed my system to shine. Before I was depleting my system. Now, I’m able to keep up with my loads and use solar to keep it charged. I can't be any happier. - Michael C.

EcoFlow DELTA Pro 3 Smart Extra Battery

Name: EcoFlow DELTA Pro 3 Smart Extra Battery
Brand: EcoFlow
SKU: EFDELTAPRO3EB
Price: 1899.0 USD
Availability: InStock

by EcoFlow

SKU: EFDELTAPRO3EB

$2,599.00

$1,899.00

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Select Number of Batteries

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2 x Batteries

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Free 30-Day Returns

✔ 100% Free Shipping
✔ Authorized EcoFlow Dealer
✔ Manufacturer Warranty Included
✔ 10,000+ Customers Trust Outbound Power
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Double Down On Power And Freedom With The DELTA Pro 3 Smart Extra Battery

Experience true energy independence with the EcoFlow DELTA Pro 3 and the DELTA Pro 3 Smart Extra Battery. This cutting-edge expansion battery seamlessly integrates with your DELTA Pro 3, doubling its capacity to a mighty 8kWh. Add a second battery and reach a sky-high 12kWh of super power.

Imagine powering your essential appliances, electronics, and even medical devices for extended periods during outages, off-grid adventures, or worksites lacking reliable electricity.

What's Included

1 x EcoFlow DELTA Pro 3 Smart Extra Battery
1 x EcoFlow Extra Battery Cable
1 x Quick-Start Guide
1 x Safety Guide
1 x Warranty Card

EcoFlow DELTA Pro 3 Smart Extra Battery Specifications

Color	Black & Galactic Silver
Weight	33 kg \| 72.7 lbs
Dimensions	694 × 295 × 215mm \| 27.3 x 11.61 x 8.4
Capacity	4096 Wh
Output	40V-58.4V=100A Maximum
Input	40V-58.4V=80A Maximum
Display	LED Array
Discharge Temperature	-10°C ~ 45°C \| 14 ~ 113°F
Charge Temperature	0°C ~ 45°C \| 32 ~ 113°F
Storage Temperature	-10°C ~ 45°C \| 14 ~ 113°F
Wheels Support	No
Tie Rod Support	No
Stack	Horizontal or Vertical
Connection	1 x Extra Battery Port

Is Outbound Power an Authorized Dealer?

Yes! Outbound Power is an Authorized Dealer for every single brand and product on our store.

How long will it take for my order to arrive?

Shipping times vary depending on your location and the product or products ordered.

Order Processing Time
Most products are processed within 1-3 business days. If there is a delay in processing your order, we will alert you with as much information as possible about what to expect.

After order processing is complete, you will receive tracking information to monitor your order while it is in transit.

Order Shipping Time
Following processing, it may take between 3 and 8 days to arrive, depending on your location.

Please refer to the product page for your item and reference the estimated delivery time frame for more details.

Additionally, you can see the estimated delivery time frame during checkout and receive a tracking number once your order ships.

What are your shipping rates? Do you offer free shipping?

Everything on our store ships for free. Really!

What is Outbound Power's return policy?

Most items may be returned within 30 days of delivery. Please refer to our Returns & Exchanges policy to determine what items are eligible. Returns are not accepted beyond 30 days following delivery.

Are Outbound Power products used/old/refurbished?

Everything sold on our website is brand-new.

Do you price match?

No — we price BEAT! Please refer to our Price Beat Promise for full details.

excellent service with excellent pricing by far

Excellent service with excellent pricing. By far the best price I could find on the battery. Delivery arrived in perfect condition. love all the tracking information.

Thank you so much for the kind review! We’re glad we could provide a great price and that everything arrived to your satisfaction. We also appreciate you mentioning the tracking updates. We want every customer to feel informed and confident from order to delivery. Thanks again for choosing Outbound Power and please let us know if we can ever be of service!

Amazing Products and Customer Service

I'm an Ecoflow adopter with the Delta Pro 3 setup. I recently saw a good deal on the second battery to complete one full setup. Do to the expense, I drug my feet a little to make sure I was making a solid decision.

While waiting (thinking) for a day or so, I received a call from Outbound. Normally, I'm not a fan of sales if I can be honest but, I took the call based on my past satisfaction with the company. After talking with the nice young lady for a few minutes, I decided to move forward. No pressure or odd sales tactics, I assure you. To my surprise, when I checked out, I had an additional discount added to my already amazing discount. In short, it was worth the journey and the delivery was a day ahead of schedule, no drama in integrating the battery and another happy customer.

Thanks Outbound Power (and your no pressure sales staff).
KL

Hi KL,

Thank you so much for taking the time to share this — what an awesome review to read. I’m really glad our team was able to connect with you at just the right moment, and even more glad to hear the call felt helpful rather than sales-y. That’s exactly the experience we strive for.

It’s great to know the extra discount was a pleasant surprise and that your new DELTA Pro 3 battery integrated smoothly into your setup. That complete system is a powerhouse, and I’m thrilled you’re enjoying the journey with it.

If you ever need anything — questions, ideas, or help planning the next step of your setup — I'm always here and happy to assist.

Thanks again for your trust and for being part of the Outbound Power family, KL!

Thanks!

I prefer to work with small companies. For several reasons..
Smaller companies rely on every sale, they are more likely to help you get the correct product at the best price.
The real benefit is after the sale. CS and tech support are more likely to be local and not in a call center in India.
They will have better product knowledge and you are more likely to speak to someone who understands how English is spoken in the US.
Outbound Power fills my requirements very well.
Thanks guys

Hi Ray,

Your note really resonated with us. As a small business, every single order and every customer relationship genuinely matters, and hearing that you value the same things we do—personalized service, real conversations, and knowledgeable support—means a lot.

We work hard to make sure every customer gets the right product at the right price, but more importantly, we want you to feel confident that if you ever need help down the road, we’ll be right here to provide it. Thank you for trusting us with your purchase and for supporting a small, dedicated team that loves what we do.

Great addition!

The smart extra battery is a great addition to the Delta Pro 3. This is piece of mind and some extra time for when you may need it most. It's incredibly simple to hook up and it just works. These were priced well at Outbound Power and they were very responsive and a pleasure to work with!

Thank you so much for the kind words!
We're thrilled to hear you're enjoying the Smart Extra Battery with your Delta Pro 3 — it's always great to have that extra peace of mind when it matters most. Glad to know setup was simple and everything just worked!

We truly appreciate your support and are always here if you need anything in the future. Thanks again for choosing Outbound Power!

Great Battery!

Ecoflow knocks it out of the park as this battery adds 4 KW to the Delta 3 plus as an add on!

Hi Robert,

Thanks so much for the 5-star review! We're glad to hear you're loving the EcoFlow DELTA Pro 3 Smart Extra Battery — it really is a powerful upgrade. EcoFlow definitely hit a home run with this one!

If you ever have any questions or need support down the line, we're just a message away.

Nothing but best price

That’s all I felt

Thank you, Chung-Yuan! We’re glad you found the best price with us. If you ever need anything else, we’re here to help!

Fast

The price was right and the delivery was fast. I can hardly wait till this item is on sale again, need a couple more. Thanks

Thank you, Kenneth, for your positive review! We're glad to hear you found the price right and the delivery fast. We appreciate your support and look forward to serving you again when this item goes on sale. Thanks for choosing Outbound Power!

Works well - plug and play

The expansion battery shipped out quickly, it was a plug-and-play install. Thanks for the positive buying experience.

Thank you, Alan, for your fantastic review! We're glad to hear that the Delta Pro 3 expansion battery arrived quickly and that the plug-and-play install was smooth for you. Your positive buying experience is exactly what we strive for, and we're here if you ever need any further assistance. Enjoy your expanded power setup!

Finished off my System

The addition of the new EcoFlow DeltaPro 3 Extra Battery Pack has really allow my system to shine. Before I was depleting my system and requiring supplemental Grid power to charge my system. Now, It able to keep up with my loads and use solar to keep it charged. OutboundPower had that best price and delivery was very quick. I can't be any happier.

Thank you, Michael, for your fantastic review! We're thrilled to hear that the addition of the Delta Pro 3 Extra Battery Pack has completed your system and helped you move away from supplemental grid power. It's great to know that our pricing and quick delivery contributed to your positive experience. We're always here to support your power needs, and your satisfaction is our priority. Thanks for choosing Outbound Power!

Full transparency and fast shipping

This is my first order from outbound and I must say will certainly not be the last. Constant, relevant communication throughout the order process and fast delivery. Outbound has become my “go to” for all my EcoFlow needs.

Thank you, Josh! We're thrilled to hear that your first experience with Outbound Power was a great one. Providing transparency, fast shipping, and great service is what we aim for. We appreciate your trust and look forward to being your go-to for all things EcoFlow!

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Great pricing

Great pricing. When I am ready to upgrade, I plan on doing business with you all again. You value customers and that is greatly appreciated. Thanks for everything.

Thank you for your kind words and support! We’re glad to hear you’re satisfied with our pricing and service. We look forward to assisting you with your upgrade when you’re ready. Thanks again for choosing Outbound Power, and please let us know if we can ever be of service.

Replacement battery

Exact fit to the Cummins 4500i small battery compartment.

Thank you for your great review! We're glad the battery fit perfectly and met your expectations. If you need anything else, please don’t hesitate to reach out, we’re always here to help.

Works

Works great

Hi Sam, thank you for your fantastic review! We're so glad to hear the Pecron Trolley Kit works great for you. If you need any further assistance, feel free to reach out. Cheers!

Perfect lightweight power supply

This was purchased to run a small compressor when our crews are on job sites where running and moving power cords is inconvenient and time consuming. The generator is lightweight and perfect for the task. We're now investing in a second unit.

Thank you for the great review! We’re glad to hear it is making work easier. We truly appreciate your business. Please let us know if there is anything more we can do to be of service!

I like outbound because they give a good deal

I like outbound because they give a good deal discount called. They help when you call nice people when you call the number they answer and help thank you

Hi Melvin, thank you for your kind words! We're glad you had a great experience and appreciate your support. If you need anything else, we're here to help!

Great customer service

Great customer service!

Thank you for the positive feedback! We strive to provide excellent customer service and we're glad to hear that you had a great experience with us. We appreciate your support and hope to continue serving you in the future!

Outbound Power did a great job on n communication

Outbound Power did a great job with communication and answered all my presale questions. Shipping was prompt - and was patient with me during a small snafu when my neighbor was being “helpful” and took one of the boxes and neglected to tell me. Great prices too!

Hi James, thank you for taking the time to leave us a review. We are thrilled to hear that you had a positive experience with our team! Thank you for your business and please feel welcome to reach out anytime if we can be of service!

Fantastic service from Jam at Outbound Power

Fantastic service from Jam at Outbound Power made this an easy choice.

We are in the installation phase now and are excited to have a reliable system for our power backup needs.

Thank you for your kind words and for choosing Outbound Power for your backup power needs. We're happy to hear that Jam provided fantastic service and helped make the decision process easy for you. Our goal is always to help customers find a reliable backup power solution that fits their needs.

We’re excited for you to begin the installation phase and are confident you’ll be pleased with the Anker SOLIX E10 Smart Hybrid Whole-Home Backup System. Thank you again for choosing Outbound Power!

This works very well

This works very well. I can charge my unit and expansion batteries more than twice as fast as using a 120 volt wall outlet. I think it also helps with the battery temperature.

Hi there, thank you for your positive feedback! We're glad to hear that the cable is working well for you and is able to charge your unit and expansion batteries at a faster rate. If we can be of service again, please let us know!

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