EcoFlow DELTA Pro Smart Extra Battery

The EcoFlow DELTA Pro Smart Extra Battery is a game-changing addition to the DELTA Pro power ecosystem, designed to extend and enhance your power capabilities. With a generous 3600Wh of additional power capacity, this smart extra battery seamlessly integrates with the DELTA Pro, allowing you to significantly expand your energy reserves. By adding two extra batteries, you can boost your total capacity up to an impressive 10.8kWh, providing you with a formidable energy source for various applications.

One of the standout features of the DELTA Pro Smart Extra Battery is its versatility when it comes to recharging options. Whether you prefer traditional AC charging, harnessing the sun's energy with solar panels, utilizing the Smart Generator, charging from your car, or even taking advantage of EV charging stations, this battery supports it all. This flexibility ensures that you can replenish your energy reserves in a manner that suits your unique circumstances and needs, making it a practical choice for a wide range of users.

Built to last, the DELTA Pro Smart Extra Battery incorporates Long-Lasting LFP (Lithium Iron Phosphate) battery technology. This translates to impressive durability and longevity, providing you with peace of mind knowing that your investment will continue to deliver reliable power for an extended period. Whether you're looking to expand your DELTA Pro's capacity or enhance your energy storage options, the DELTA Pro Smart Extra Battery is a dependable and versatile solution that ensures you're always powered up when you need it most.


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 4 reviews
Richard Hendricks
Sturdy and Nice looking

The extra battery for my Eco Generator is top notch. Eco Generators are the best on the market in my opinion. My batteries keep me running 24/7 now I don't even have to turn on my power generator for a backup charge.

Patrick Masayon
Great, Well-Built Product

Again... great product...and should last a long time. Thanks Eco Flow for a well-built item.

Anthony Taguran
Plenty of power for my RV with added smart battery

additional power that lasts

Vaughn Dolor
Add additional reserve power for the Delta Pro

Need the additional reserve power for my Delta Pro. After calculating my power requirement (about 5.5kwh) for the house (for 24 hour of emergency essential backup), i need the additional power from the Extra Battery. At 3.6 kwh for the Deltapro , adding the extra battery make it whole system to 7.2kwh. Accounting of 5% min (for the discharge rate) to a max of 95% (for the max Charge rate) should leave me a capacity of about 6.5kwh.