EcoFlow DELTA Max Smart Extra Battery

The EcoFlow DELTA Max Smart Extra Battery is the ideal companion for enhancing the power capacity of your DELTA 2, DELTA Max, or DELTA 2 Max Portable Power Stations. With a substantial 2016Wh of additional battery capacity, this smart extra battery is designed to provide you with extra energy reserves when you need it most.

What sets the DELTA Max Smart Extra Battery apart is its expandability. By adding one or two extra batteries to your DELTA 2, DELTA Max, or DELTA 2 Max, you can expand the total capacity up to an impressive 6kWh. This means you have the flexibility to tailor your power supply to match your unique energy requirements, ensuring you always have the necessary power on hand.

Recharging your DELTA Max Smart Extra Battery is a breeze, thanks to its versatile compatibility. You can easily recharge it using various sources, including AC outlets, solar panels, the EcoFlow Smart Generator, or even car charging. This convenience ensures that your extra battery is always ready to provide you with the additional power you need, whether you're at home, on the go, or in an emergency situation.

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 2 reviews
Tae Yhung
Extra POWER!

This pairs nicely with my delta 2.
So far ECOFLOW products haven’t disappointed.

Kristoffer Drey
Great addition

I'm really glad I got this extra battery,it has helped my delta max run so much longer, but also seems to have helped a problem we were having with our power station shutting down the ac inverter once it reached 100 percent charge. That doesn't seem to be happening now