Coming at us through its official Amazon storefront, EcoFlow is undercutting its ongoing Memorial Day Sale pricing (ending May 28) on the DELTA 2 Smart Extra Battery for $428.99 shipped. This add-on unit normally fetches $799 at full price directly from the brand, but has been starting from $599 in 2025 at Amazon. Discounts have mostly kept costs above $449, though we did see two previous dips to this low. It’s beating out EcoFlow’s direct sale pricing by $30, giving you $170 in savings off its going Amazon rate ($370 off its MSRP) at the lowest price we have tracked.
This add-on battery from EcoFlow is the perfect addition for folks with an existing DELTA 2 power station who want to get far more backup power support for traveling and at-home needs. The battery sports a 1,024Wh LiFePO4 capacity that can be added to your existing station, giving you 2,048Wh with one or bumping things as high as 3,072Wh when adding two to your setup. Right alongside the station, this battery comes rated for 3,000+ life cycles, giving you over eight years of use if you were planning to discharge and recharge it every single day.
If you were considering starting your backup setup, you can check out EcoFlow’s ongoing Memorial Day deals running through May 28 – which include extra savings (code EF25MEM) that drops the power station and extra battery bundle to $997 from $1,798 – which beats Amazon by $2.
Be sure to also check out the other Memorial Day Sales that are still continuing for a short while longer, collected together in our Electrified roundup from Saturday. You can also browse the latest savings as they come in by browsing through our Green Deals hub.
EcoFlow DELTA 2 Smart Extra Battery features:
- Extra Battery Capacity. Add on to your DELTA 2 to expand capacity to 2048Wh. Easy setup to meet a wide range of needs from home backup power to outdoor use.
- Lasts Years on End. As a portable battery with an LFP battery chemistry, it lasts years on end with regular use. 3000+ cycles to be precise.
- Charge Your Way. The DELTA 2 Extra Battery allows you to charge fast with multiple methods. Choose AC outlets, car outlets, solar panels or even our Smart Generator. With that, you can go for 0-80% in 80 mins.
- Power Pretty Much Anything. With a 1800W output & 15 outlets when paired with DELTA 2, you can power 90% of home appliances.
- Control and Monitor. With an onboard LCD screen and an EcoFlow app you can check all your essentials. Remaining charge, hours remaining at current output, and a whole lot more.
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