EcoFlow DELTA 2 Max Smart Extra Battery

Introducing the EcoFlow DELTA 2 Max Smart Extra Battery, a game-changer in energy storage technology. With its expandable capacity, this innovative battery allows you to increase the power reserve of your DELTA 2, DELTA Max, or DELTA 2 Max by an impressive 2048Wh. This means you can now have even more power at your disposal to cater to your specific energy storage requirements. Whether it's for home backup, RVing, outdoor adventures, or daily use, the DELTA 2 Max Smart Extra Battery ensures you're never left in the dark.

The DELTA 2 Max Smart Extra Battery triples your power potential, offering an expandable capacity ranging from 2kWh to a formidable 6kWh. By adding up to two of these extra batteries, you can reach an astounding total capacity of 6144Wh, guaranteeing a robust and reliable energy source. What truly sets this battery apart is its longevity, as it is built to last six times longer than conventional alternatives. With its LFP battery chemistry, it boasts an impressive lifespan of 10 years with daily use before reaching 80% of its original capacity. This equates to an astonishing 3000+ cycles, ensuring that your investment is not only powerful but also exceptionally durable.

For added peace of mind, the EcoFlow DELTA 2 Max Smart Extra Battery comes backed by a generous 5-year warranty. This warranty underscores the confidence that EcoFlow has in the quality and performance of their product, offering you the assurance that your investment is protected for years to come. When it comes to expanding your energy storage capacity while ensuring longevity and reliability, the DELTA 2 Max Smart Extra Battery is the ideal choice for those who demand the best in energy solutions.


Why buy from Wheels & Chairs?

  • Price - Wheels & Chairs offers the lowest price possible as allowed by our manufacturers. You won't be able to find any of our items for less than what we offer on the market.
  • Service - Our knowledgeable customer service team has the BEST response times in the industry. If you send a message to live chat and don't hear a response in 5 minutes or less, you get a discount.
  • Free Shipping in the US - We ship to anywhere in the US for absolutely free (contiguous states only). It's on us.
  • Return Policy - We match the return policies of our manufacturers for all products giving you the best possible deal (usually free returns within 30 days plus a restocking free. See the full return policy in "Shipping | Warranty | Returns" tab above.


We offer free shipping on all products.

Estimated Shipping Time: 7 Business Days


The EcoFlow service team will take care of all the after-sales issues. If any quality issues are involved, please feel free to contact our service team


Customers can request a full refund within 24 hours after placing an order on

Please note that we will charge a transaction fee if you apply for the refund 24 hours after the order is placed and before delivery has been made (2.6% for credit card users, 3.6% for PayPal users, 3.5% for Affirm users, 3.3% for Klarna users). 

Orders cannot be canceled more than 30 days after they are shipped.


The return service is currently available to US orders only. 

If you are unsatisfied with your purchase, you may return the purchased items complete in their original packing within 30 days of receiving them for an exchange or refund.

If 30 days have passed since your purchase, we cannot offer a refund or exchange.

For quality issues, we will give you a full refund or one-time free replacement within 30 days of receiving the items.

Please collect the package first if your order has been shipped and you want to return it. Then contact our Wheels & Chairs Support via to obtain instructions to return.

Please note that a double shipping fee may be deducted from the original payment if you reject the shipments.

You’ll be charged for shipping and a transaction fee (2.6% for credit card users, 3.6% for PayPal users, 3.5% for Affirm users) in the event of a return on US orders.

Return Process

Contact Wheels & Chairs at to start the return process. Please provide them with proof of purchase, such as an invoice.

You will receive instructions on how to properly pack the products and return them to us. Please make sure all components are included in the package. 


After you have returned the product to our warehouse, we will issue a refund within 14 business days. You will be notified by email when your order is refunded. If you have not received the refund after 14 business days, please contact us via

Return Shipping Cost

Please note that return shipping costs include shipping costs and handling fees.

After-sale Service Contact

Phone: +1 (757) 654-1727 (English service only. International charges apply if calling from outside of the US)

Got questions? Read through our FAQ page listed in our Main Menu to see if it's answered there! If not, please contact us either through the chatbot found on the bottom right of the screen or via this form.

Customer Reviews

Based on 3 reviews
Barry W
Works great but charging is disappointing.

I have several ecoflow products and have always liked them, so maybe I don't understand something about how solar power works, but the charging of this battery is disappointing.

I received this battery with 30% charge so I hooked it up to my Delta Max 2000 base unit with multiple solar panels connected.

When I set it up, the base unit said it was 100% charged, so I assumed that whatever power was generated by the solar panels would go directly to the second battery, but apparently that isn't how things work, or at least that's not how it's working in my case.

As you can see in the attached picture, the base unit is now showing it to be 99% charged, with 243w of input and ONLY 118w of output. The extra battery above it shows only 115w of input.

That means that the extra battery is only receiving 43% of the solar power being received by the base unit. I find that number to be incredibly inefficient. It means that if my power goes out and I need to rely on my solar power, my ability to recharge is severely limited, which defeats the purpose of having solar backup.

I called ecoflow and they said that the extra batteries recharge much faster if you use A/C, but that's worthless if you don't have A/C.

So I guess that means that your extra batteries are not nearly as useful in a power outage situation as I expected them to be, unless the outage is quickly resolved.

Bottom line, you aren't really doubling your power by adding an extra battery unless it's only for a day or so. You might want to consider a second base unit instead of an extra battery. That can be solar charged in less than half the time, and is much more useful and flexible than the extra battery that must be attached to the base unit to be used at all.

Regine Binoya
Ecoflow = the best

Very happy with our purchase. The customer service, shipping and quality are at the top with this brand.
We bought it to expand the power of our ecoflow delta max 2000 battery, and it really worth it !

Merly Radmon
2kWh Of Additional EcoFlow Power

Bought the EcoFlow Delta 2 Max 2kWh Extra Battery for my Delta 2 instead of the regular Delta 2 Extra Battery because I wanted more power for my Delta 2. I now have a total of 3kWh of power with my Delta 2 when the extra battery is connected. The extra battery does what it is designed to do, appears well made and integrates very well with the EcoFlow Delta 2. The battery management system of the Delta 2 automatically keeps both the internal battery pack and the extra battery's battery pack balanced when connected. Whether you pair this extra battery with a Delta 2 or a Delta 2 Max, I don't think you can go wrong with purchasing this extra battery.