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EF ECOFLOW

EF ECOFLOW DELTA 2 Max Power Station Extra Battery, 2048Wh LiFePO4 Battery

  • Based on 351 reviews
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Availability: In Stock.
Fulfilled by EcoFlow Inc.
Arrives Sep 29 – Oct 1
Order within 7 hours and 26 minutes
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Style: DELTA 2 Max Extra Battery


Features

  • Expandable Capacity. Increase the capacity of DELTA 2 Max with an extra 2048Wh.
  • Triple the Power. 2-6kWh expandable capacity to fit your energy storage needs. Add up to two DELTA 2 Max Smart Extra Batteries to hit a capacity of 6144Wh. Ideal for home backup, RVing, outdoors or even everyday use.
  • Built to Last 6 Longer. Get 10 years of daily use until hitting 80% of its original capacity. Thats down to its LFP battery chemistry giving you 3000+ cycles.

Description

Without internal combustion engines, solar generators are extremely quiet. From a distance of approximately 20 inches, the noise level of a DELTA 2 Max solar generator (low input and output of around 500W) is only 30 dB, versus others with a volume of 45 dB or higher. In comparison, gas generators can run at an average of 70 dB even from a distance. Solar generators don't burn fossil fuel, so with zero emissions or fumes, they're a clean replacement for gas generators. Unlike gas generators, there's no fuel to refill, filters to clean, or moving parts to break. Without engine oil level checks, oil changes or spark arrestor inspections, spend more time on doing what you like. Outdoors is the only safe place to operate a portable gas generator, keeping your family safe from toxic carbon monoxide. Since it doesn't emit any fumes you can use a solar generator anywhere, inside or out.

Brand: EF ECOFLOW


Wattage: 2048 watt-hours


Fuel Type: Electric


Power Source: Solar Powered


Recommended Uses For Product: Camping


Item Weight: 42 pounds


Voltage: 120 volts


Output Wattage: 2048


Special Feature: Expandable capacity


Included Components: EcoFlow DELTA Max Extra Battery


Wattage: 2048 watt-hours


Fuel Type: Electric


Power Source: Solar Powered


Recommended Uses For Product: Camping


Voltage: 120 volts


Output Wattage: 2048


Additional Features: Expandable capacity


Engine Type: 4 Stroke


Ignition System Type: Electronic


Engine Displacement: 79 cubic centimeters


Total Power Outlets: 6


Starting Wattage: 3400 watts


Frequency: 50 hertz


Runtime: 601600 hours


Color: Black/Grey


EU Spare Part Availability Duration: 10 years


Brand Name: EF ECOFLOW


Included Components: EcoFlow DELTA Max Extra Battery


Model Name: DELTA 2 Max


Model Number: EFD350


UPC: 842783131614


Manufacturer: EcoFlow


Item Type Name: DELTA 2 Max Extra Battery


Manufacturer Part Number: EFD350


Warranty Description: 1 year manufacturer


Item Weight: 42 pounds


Item Dimensions L x W x H: 11"L x 9"W x 18"H


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 29 – Oct 1

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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  • Affirm Pay in 4
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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • DEFINITELY a must have for an add on to 1kwh batteries!
I bought 3 of Delta 2 batteries, along with a Delta 2 Max extra battery to extend one of the batteries out to 3kwh, and a couple river 2 pro and river 2 max batteries (and about 2200w in solar panels). They are extremely handy in a power outage situation (just tested for days after hurricane Milton), for example 1 delta 2 could run my fridge for about 16 hrs, but with the delta 2 max extra battery, that extended it to about 40-45 hrs! Not too shabby, but if you have panels, and there's no sun...well, gas inverter generator works to power them fairly quickly. That being said, I stockpiled about 8kwh in total in ecoflow batteries in addition to 9 panels of varying strengths ranging from 200w-400w each, with the intention on being able to run my fridge, freezer, internet, power some things like tv, computers, etc, but most importantly, being Florida, my portable AC. It did all of the above great (except for the multi-day cloud cover preventing the panels from being useful), but when attempting to use my portable AC, even on a delta 3 plus (same size, but provides 2 solar inputs and more output for ac plugs), it immediately shuts down the portable AC and goes into an overload status. So, it checked nearly every box, but 90 degrees in a house in florida without ac can really really suck. It did power a few 20" box fans nicely, so I made a bit of a swamp cooler of sorts with those instead. All in all, VERY useful during a multi-day outage, but make sure you have an inverter generator to charge them as well. You will use far less gas from your gas generator in charging these and letting them take over primary power for everything that you would using the gas generator alone. The extra battery really is a must have, because it extends the range of the 1kwh and 2kwh batteries significantly! Just don't be tricked by the fact the main battery always says there is input, even when not hooked to AC power or panels. ... show more
Reviewed in the United States on October 13, 2024 by Lucky B
    • Fantastic Fast Delivery of a Quality Product
Review Image by Mario Navarro
This EcoFlow 2Max Extra Battery was delivered today and I am very pleased to say it so far functions very good and nothing was broken or damaged during the shipping and delivery process as before in a previous same purchase. I can confirm that the operation and functionality is exactly as described in the advertisement for this product and additional 2048 Watts to my solar generator system will definitely cover my electricity needs during this upcoming summer months and fire season when the main power supply grid is shutdown for public safety. I would recommend these devices be purchased for your homes in case of any future power outages because they are very efficient and and very easy to use and will save you money and discomfort during the upcoming months. Long story short, the EcoFlow company works with customers to help purchase their products by offering different types of payment plans that are compatible with many budgets so anyone can afford to pay for a important product that will help them during power outages that occur very frequently nowadays. Thank you (I’m pretty sure I will purchase one more extra battery so I can run my air conditioner when the heat is causing the power grid to be shut down and instead I will be enjoying my regular life without disruption and sweating in the heat waiting for the power company to turn back on the grid power supply to every house ) ... show more
Reviewed in the United States on February 21, 2025 by Mario Navarro
    • Works like a charm
Has not disappointed! All around great sense of security (power backup)if something goes wrong with the electric supply to the house. Have tested it on many different items for hours on top of hours. It is heavy but simply solved by building a cart that holds the station and extra battery (or 2 batteries). Charges quick by AC power. Planning on testing solar charge soon. ... show more
Reviewed in the United States on May 30, 2026 by L & F
    • Great expansion. About to get me another
Review Image by Derk
I have the delta 2 and needed more capacity. Although it is not listed or pictured. It came with the connector cord. It arrived really fast. I was able to run my fish tank all night for 10 hours and still had 30% capacity. Now I just need to get my solar panels in the roof to get my tank off grid. Should save me 100$ a month. That's what my edison bill is costing me . I also camp often and bring my battery as a back up for days my solar panel doesn't produce enough . These are petite enough to dig under my dinette. It's saved me twice already now. One day I'll get another expansion pack!!! It's convienent enough that I drag it with me to work some days when I know I'm out on the field all day. I run a small microwave to heat up lunch so I'm not eating cold food like a cave man . ... show more
Reviewed in the United States on April 26, 2026 by Derk
    • Solid Capacity Expansion with Reliable Performance
The EF ECOFLOW DELTA 2 Max Extra Battery is a useful expansion for increasing power capacity. The 2048Wh LiFePO4 battery provides a substantial boost, making it helpful for longer runtime during outdoor use, backup power, or extended projects. Connection to compatible units is straightforward, and the battery integrates seamlessly with supported models. The build quality feels durable and well-constructed, and the unit remains stable during operation. Despite the large capacity, the design is manageable and consistent with the main power station. Performance has been reliable, with steady output and no noticeable issues during use. The LiFePO4 chemistry is also reassuring for longevity. Overall, it’s a practical add-on for anyone looking to expand capacity and extend usage time. ... show more
Reviewed in the United States on April 8, 2026 by Alyssa
    • service complied
The battery is good, The seller shipped the 45W panel and everything is fine. Thanks
Reviewed in the United States on June 29, 2026 by Carlos Jiménez Soler
    • Reliable Expansion Battery for the DELTA 2 Max
This expansion battery has been a great addition to my DELTA 2 Max setup. The connection process was straightforward, and the unit was recognized immediately by the power station. It provides the extra capacity I was looking for and helps extend runtime for my devices during outages and outdoor use.
Reviewed in the United States on June 15, 2026 by Eliamny
    • Great communication
Great device, literally plug n play. Wasn't exactly what I was expecting and didn't meet my requirements. Ecoflow was great with communication. Will definitely look at more of their products.
Reviewed in the United States on March 21, 2026 by thomas/heather

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