Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
Missed This Deal? Get alerts when similar deals are posted.
expired
expired
David_David 10.2K Views
Nov 7, 2025 11:46 AM

Costco Members: 2-Pack EcoFlow DELTA 3 Series 1024Wh Smart Extra Battery

$620

$720

13% off
+ Free Shippingat Costco Wholesale
Visit Retailer

Why are you downvoting this deal?

Good Deal?
14Comments
Save
Share
Deal Details
EcoFlow via Costco Next has for Costco Members: 2-Pack EcoFlow DELTA 3 Series 1024Wh Smart Extra Battery on sale for $619.99 when you follow the steps below. Shipping is free.

Thanks to Community Member David_David for sharing this deal.
  • Note: You must click-through the Costco Next page with a active Costco Membership Account in order to get this deal.
Steps:
  1. Go to the Costco Next EcoFlow page.
  2. Ensure you are logged in with your Costco Account via the top-right of the page.
  3. After you are logged in, select the Visit EcoFlow button on the page to proceed to the EcoFlow Costco Next site.
    • Note: This step is required in order for the following page to work.
  4. Go to the 2-Pack EcoFlow DELTA 3 Series 1024Wh Smart Extra Battery page and add to cart.
  5. Your total will be $619.99 with free shipping.
About this Item:
  • Increase the capacity of DELTA 3 Plus/DELTA 3 with two extra 1024Wh *Please note that only one DELTA 3 Series Smart Extra Battery can be connected to the power station at a time.
  • Get 10 years of daily use until it hits 80% of its original capacity. Embrace 3000+ charging cycles enabled by the LFP battery chemistry.
  • Plug-and-play system. Use the EcoFlow app to monitor and control the DELTA 3 Smart Extra Battery.
  • With one of the most comprehensive 5-year warranties available, we go the extra mile to give you peace of mind.
  • Compatible with DELTA 2 and DELTA 3 series

Editor's Notes

Written by SaltyOne | Staff
  • At the time of this posting, our research indicates that this is $157.11 lower than the next best comparable online prices starting from $777.10.
  • Rated 5 out of 5 stars from EcoFlow customers.
  • Offer valid for a limited time only / while supplies last.

Original Post

Written by David_David
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
EcoFlow via Costco Next has for Costco Members: 2-Pack EcoFlow DELTA 3 Series 1024Wh Smart Extra Battery on sale for $619.99 when you follow the steps below. Shipping is free.

Thanks to Community Member David_David for sharing this deal.
  • Note: You must click-through the Costco Next page with a active Costco Membership Account in order to get this deal.
Steps:
  1. Go to the Costco Next EcoFlow page.
  2. Ensure you are logged in with your Costco Account via the top-right of the page.
  3. After you are logged in, select the Visit EcoFlow button on the page to proceed to the EcoFlow Costco Next site.
    • Note: This step is required in order for the following page to work.
  4. Go to the 2-Pack EcoFlow DELTA 3 Series 1024Wh Smart Extra Battery page and add to cart.
  5. Your total will be $619.99 with free shipping.
About this Item:
  • Increase the capacity of DELTA 3 Plus/DELTA 3 with two extra 1024Wh *Please note that only one DELTA 3 Series Smart Extra Battery can be connected to the power station at a time.
  • Get 10 years of daily use until it hits 80% of its original capacity. Embrace 3000+ charging cycles enabled by the LFP battery chemistry.
  • Plug-and-play system. Use the EcoFlow app to monitor and control the DELTA 3 Smart Extra Battery.
  • With one of the most comprehensive 5-year warranties available, we go the extra mile to give you peace of mind.
  • Compatible with DELTA 2 and DELTA 3 series

Editor's Notes

Written by SaltyOne | Staff
  • At the time of this posting, our research indicates that this is $157.11 lower than the next best comparable online prices starting from $777.10.
  • Rated 5 out of 5 stars from EcoFlow customers.
  • Offer valid for a limited time only / while supplies last.

Original Post

Written by David_David

Community Voting

Deal Score
+17
Good Deal
Bad Deal

Why are you downvoting this deal?

Visit Retailer

Top Comments

UltraLazer
1.6KComments
186Reputation
Ecoflow naming conventions have gone off the rails. No one knows what product does anything anymore
Go to Comment

Community Reviews

This two pack of EcoFlow DELTA 3 Smart Extra Batteries stands out as a strong expansion option when you need more runtime for compatible Delta 3 and Delta 2 setups. The effective price works out to about $320 per battery, which is well below EcoFlow direct pricing and still looks reasonable versus a recent Costco battery deal. Compatibility is the main catch, though, since these do not work with the Delta 3 Ultra, River 3 Plus, or the newer Delta 3 Classic, and they cannot be daisy chained like Delta Pro batteries. A solid add on if your power station matches the right series.

Common Questions (5)

  • It does not work with the Delta 3 Ultra because that model has no expansion port. The Delta 3 Ultra Plus does have an expansion port, but it uses the larger Pro expansion batteries instead.

    cccheelWickedcarny

  • Yes, it works with the regular Delta 2. It can be a practical add-on if you already own that unit and want extra capacity.

    lurewars

  • No, it cannot be daisy chained like the Delta Pro extra batteries. That limits how far you can expand a setup with multiple batteries.

    Neo42

  • No. The River 3 Plus only accepts the 300EB or 600EB expansion batteries, and only one of them can be added.

    CHarris82

  • The deal works out to about $320 per battery. That is below EcoFlow's direct pre-Black Friday price of $409 each.

    CyanFog2620

AI-generated summary based on comments from the community. Updated ago

Join The Conversation

Share your experience with the Slickdeals community

Share information with the community. Please follow our Community Guidelines and be kind!

14 Comments

Sign up for a Slickdeals account to remove this ad.

Nov 7, 2025 1:15 PM
4.4K Comments
Joined Mar 2006
cccheelNov 7, 2025 1:15 PM
4.4K Comments
These can't be used with the Delta 3 Ultra, correct?
Nov 7, 2025 1:22 PM
726 Comments
Joined Mar 2016
WickedcarnyNov 7, 2025 1:22 PM
726 Comments
Quote from cccheel View quoted comment :
These can't be used with the Delta 3 Ultra, correct?
Delta 3 ultra doesn't have an expansion port. The Ultra Plus does.
Either way I believe the ultra plus uses the larger pro expansion batteries.
Nov 7, 2025 2:05 PM
162 Comments
Joined Dec 2006
fmoNov 7, 2025 2:05 PM
162 Comments
Essentially the same or a bit worse than the deal for 2x Delta 2 Max batteries on Costco a few weeks ago ($1199 for 2 batteries, 2048 kWh each), different power unit of course
Nov 7, 2025 4:12 PM
1.6K Comments
Joined May 2006
UltraLazerNov 7, 2025 4:12 PM
1.6K Comments
Quote from Wickedcarny View quoted comment :
Delta 3 ultra doesn't have an expansion port. The Ultra Plus does.
Either way I believe the ultra plus uses the larger pro expansion batteries.
Ecoflow naming conventions have gone off the rails. No one knows what product does anything anymore
1
Nov 7, 2025 10:04 PM
13 Comments
Joined Nov 2024
CyanFog2620Nov 7, 2025 10:04 PM
13 Comments
At $320/battery this is a stellar deal, Ecoflow direct has these on their pre-BF sale for $409
Nov 8, 2025 1:34 AM
4.3K Comments
Joined Sep 2005
Neo42Nov 8, 2025 1:34 AM
4.3K Comments
Decent price for these but wish they could be daisy chained like the delta pro and extra batteries for it. I've got a d3 plus and one of these, it has never crossed my mind to get more extended batteries
Nov 9, 2025 4:04 AM
30.3K Comments
Joined Oct 2010
Medic311Nov 9, 2025 4:04 AM
30.3K Comments

Our community has rated this post as helpful. If you agree, why not thank

Quote from UltraLazer View quoted comment :
Ecoflow naming conventions have gone off the rails. No one knows what product does anything anymore
Yep. They know they have a problem. Here is their current list for just Delta 3. It's out of control.

Delta 3 Max
Delta 3 Max Plus
Delta 3 Classic
Delta 3 <<<<----- this one here
Delta 3 1500
Delta 3 Plus
Delta 3 Pro
Delta 3 Ultra
Delta 3 Ultra Plus




That's why a few days ago they sent this email out:




EcoFlow

Hello,

As a clean energy technology brand serving customers worldwide, EcoFlow aims to use this survey to gain deeper insights into how users in different countries and regions perceive product names and positioning — so future naming can maintain high recognition and a clear sense of positioning across diverse languages and cultures.

Whether or not you have purchased an EcoFlow product, we welcome your feedback. Your input will help us refine naming and lineup structure, enabling customers to quickly identify the model that best meets their needs.

The survey takes about 3–5 minutes to complete, and all responses will be used for research purposes only, with strict privacy protection and no sales follow‑up.

👉 Take the Survey

Thank you for your time and valuable insights!

EcoFlow Team
1

Sign up for a Slickdeals account to remove this ad.

Original Poster
Pro
Nov 9, 2025 4:31 AM
351 Comments
Joined Mar 2025
David_DavidNov 9, 2025 4:31 AM
Original Poster
Pro
351 Comments
[QUOTE=Medic311;180061276]

I can appreciate you want to help people, however there is no Delta 3 Pro.
There is a Delta PRO 3 on the PRO series line (240V capable) not on the 3 series.

And respectfully when you continue to copy and publish this list it only adds further to confusion and mis-information.
1
Nov 9, 2025 4:44 AM
30.3K Comments
Joined Oct 2010
Medic311Nov 9, 2025 4:44 AM
30.3K Comments

Our community has rated this post as helpful. If you agree, why not thank

Quote from David_David View quoted comment :

I can appreciate you want to help people, however there is no Delta 3 Pro.
There is a Delta PRO 3 on the PRO series line (240V capable) not on the 3 series.

And respectfully when you continue to copy and publish this list it only adds further to confusion and mis-information.
Ah yes, "Delta Pro 3".......now that we have straightened that out:


Delta 3 Max
Delta 3 Max Plus
Delta 3 Classic
Delta 3
Delta 3 1500
Delta 3 Plus
Delta 3 Ultra
Delta 3 Ultra Plus
Delta Pro 3

....Oh wait, there's even more Pro:

Delta Pro Ultra
Delta Pro Ultra X


What a massive mess
1
Original Poster
Pro
Nov 9, 2025 4:53 AM
351 Comments
Joined Mar 2025
David_DavidNov 9, 2025 4:53 AM
Original Poster
Pro
351 Comments
Quote from Medic311 View quoted comment :

Ah yes, "Delta Pro 3".......now that we have straightened that out:


Delta 3 Max
Delta 3 Max Plus
Delta 3 Classic
Delta 3
Delta 3 1500
Delta 3 Plus
Delta 3 Ultra
Delta 3 Ultra Plus
Delta Pro 3

....Oh wait, there's even more Pro:

Delta Pro Ultra
Delta Pro Ultra X


What a massive mess
...and I don't even disagree with there being too many names LOL. ordered by capacity could help as well.

3 Series
Delta 3 Classic (1kWh)
Delta 3 (1kWh)
Delta 3 Plus (1kWh)
Delta 3 1500 (1.5kWh)
Delta 3 Max (2kWh)
Delta 3 Max Plus (2kWh)
Delta 3 Ultra (3kWh)
Delta 3 Ultra Plus (3kWh)

Pro series
Delta Pro (3.6kWh)
Delta Pro 3 (4kWh)
Delta Pro Ultra (6-30kWh)
Delta Pro Ultra X (12-60kWh)

...and you're gonna love two more are on the way 😂

Delta 3 1000 Air
Delta 3 2000 Air
1
1
Nov 9, 2025 7:42 AM
1.2K Comments
Joined Nov 2009
velocirapt0rNov 9, 2025 7:42 AM
1.2K Comments
Only supports the old version not the new classic
1
Nov 9, 2025 9:37 AM
1.4K Comments
Joined Mar 2009
lurewarsNov 9, 2025 9:37 AM
1.4K Comments
And just for the record these also work great with the regular Delta 2. Bought a couple of these recently when they were on sale for around $286 each. But this price isn't too bad if you need two of them
Nov 10, 2025 2:50 PM
179 Comments
Joined Feb 2019
WhitedliteNov 10, 2025 2:50 PM
179 Comments
will these work with the ECOFLOW River 3 Plus? https://www.costco.com/p/-/ecoflo...&langId=-1
Nov 11, 2025 3:04 PM
372 Comments
Joined May 2016
CHarris82Nov 11, 2025 3:04 PM
372 Comments
Quote from Whitedlite View quoted comment :
will these work with the ECOFLOW River 3 Plus? https://www.costco.com/p/-/ecoflo...&langId=-1
Unfortunately no. Only the 300EB or 600EB can be added to the River 3 Plus (and only 1).

Join The Conversation

Share your experience with the Slickdeals community

Share information with the community. Please follow our Community Guidelines and be kind!

Related Searches

Home & Home ImprovementOccasionsBlack FridayVeteran's DayTech & ElectronicsTech AccessoriesBatteries