The Delta 2 Max extra battery has now completed my power outage protection. I am worry free from an extended outage and can keep my living area running while in comfort for more than 8 hours. Great addition to our comfort.- Cheryl B.

EcoFlow DELTA 2 Max Smart Extra Battery

Name: EcoFlow DELTA 2 Max Smart Extra Battery
Brand: EcoFlow
SKU: EFDELTA2MaxEB
Price: 699.0 USD
Availability: InStock

by EcoFlow

SKU: EFDELTA2MaxEB

Save $700.00

$1,399.00

$699.00

Found a lower price?

Send us a request and we’ll beat it today — guaranteed!

1-888-976-5443 (Call/Text)

sales@outboundpower.com

Instant Live Chat

Select Number of Batteries

1 Battery

2 Batteries

Quantity

Authorized EcoFlow Dealer

Friendly Lifetime Support

Free 30-Day Returns

EcoFlow DELTA 2 Max Smart Extra Battery Overview

Double the runtime of your EcoFlow DELTA 2 Max Portable Power Station with this add-on battery that plugs into any DELTA 2 Max. Add up to two DELTA 2 Max Extra Battery units for a total capacity of 6144Wh.

EcoFlow DELTA 2 Max Smart Extra Battery Features

Convenient Recharging

DELTA 2 Max and its Extra Battery charge and discharge in unison. Whether you’re recharging DELTA 2 Max from solar panels, AC outlets, a vehicle, the Dual Fuel Smart Generator, the DELTA 2 Max Extra Battery will recharge alongside.

Independent in Emergencies

The extra battery even recharges directly from EcoFlow’s Smart Generator without DELTA 2 Max. That’s more recharging options to fit any situation.

Easy to Use LCD Screen & EcoFlow App

Get all the info on battery percent, time until full, time until empty, and more on the DELTA 2 Max Extra Battery LCD screen. Check the battery’s status anywhere on the EcoFlow app.

What's In The Box

1 x EcoFlow DELTA 2 Max Smart Extra Battery
1 x EcoFlow DELTA 2 Max Extra Battery Cable
1 x User Manual
1 x Warranty Card

EcoFlow DELTA 2 Max Smart Extra Battery Specifications

Weight	Approximately 19 kg (42 lb)
Dimensions	464 × 235 × 283 mm \| 18 × 9 × 11 in
Capacity	2,048Wh
Extra Battery Port Input	51.2V 2,000W Max (X-Stream and solar dual charging)
Extra Battery Port Output	51.2V 3,200W Max
Battery Type	LFP
Cycle Life	3,000 cycles to 80% + capacity
Protection Type	Over Voltage Protection, Overload Protection, Over Temperature Protection, Short Circuit Protection, Low Temperature Protection, Low Voltage Protection, Overcurrent Protection
Optimal Operating Temperature	20°C–30°C (68°F–86°F)
Discharging Temperature	-10°C–45℃ (14°F–113°F)
Charging Temperature	0°C–45°C (32°F–131°F)
Storage Temperature	-10℃–45℃ (14°F–113°F) (Optimal: 20°C–30°C (68°F –86°F))

EcoFlow DELTA 2 Max Smart Extra Battery Manual

EcoFlow DELTA 2 Max Smart Extra Battery Manual

Fast Delivery at a Great Price

My batteries arrived quickly in perfect condition. They had the best price to boot too.

Hi Wayland,

Thank you for your kind words and 5-star review! I’m so glad to hear your DELTA 2 Max Smart Extra Batteries arrived quickly and in perfect condition. We work hard to make sure our pricing is as competitive as possible, so it’s great to know you felt you received the best value too.

I truly appreciate you choosing Outbound Power, and I hope your new setup serves you well for years to come. If you ever have any questions or need support down the road, don’t hesitate to reach out—we’re always here to help.

So far so good. Easy to use with Delta 2 Max generator. Got a great price (actually paid 899.00) and quick delivery with Outbound Power. I highly suggest you at least check out them before making a purchase. I like supporting small businesses while also saving money.

We are thrilled to know the Delta 2 Max is working so well for you. It was our pleasure to be of service!

Additional Reliable Power

The EcoFlow Delta 2 Max extra battery has now completed my power outage protection. With the Delta 2 Max and extra batteries I am worry free from an extended outage and can keep my living area, fridge including a portable A/C, swamp cooler, powerful fan and small electronics running while in comfort for more than 8 hours. Great addition to ensure our comfort.

This is outstanding to hear. Congratulations on a terrific setup and we could not be happier that you now have greater power security!

Excellent Service and Amazing Shipping

After going without power for 3 days I decided to call Bill at Outbound Power to see about the availibilty of a Extra Battery for my Delta 2 Max. Outbound Power performace is exceptional, recieved my battery in 2 days, packaging was excellent the Battery was easy to setup and easily doubled my capacitry. Thank you Bill and everyone at Outbound Power. My next order will be placed with you. I enjoyed our conversations. Best Regards

Hi David, thank you for your very kind review. It was a true pleasure speaking with you and serving you again. If there is ever anything I can do to be of assistance, please feel welcome to call. - Bill

Bought some additional batteries. Super easy to install and increase the solar capacity.

Works great

I purchased this cable to connect my Ecoflow DPU Ultra inverter with 5 batteries battery, to the 2nd port of my Ecoflow SHP-2, after purchasing a new inverter from Outbound power. (A new inverter, does not come with a dedicated SHP-2 cord) Works as intended with enough reach. Would buy again.

Power bank we didn’t know we needed

We received the Trail as a free gift of the EcoFlow Black Friday promotion. We live in an off-grid cabin, and have a couple small 1 watt fans for moving air - the Trail has been perfect for this use. It has almost as much juice as our much heavier and bulkier Jackery 300. We love it.

Hi Kate,

Thank you so much for sharing this! We’re thrilled to hear the EcoFlow TRAIL 200DC has been such a great fit for your off-grid cabin. It’s awesome to know it’s delivering that kind of performance in such a compact package—and even holding its own against a larger unit.

We really appreciate you taking the time to leave a review, and we’re glad the Black Friday promo turned into something genuinely useful for you. If you ever need anything else or have questions down the road, we’re always here to help.

Thanks again for choosing Outbound Power!
Best regards,
Bill

Awesome

Hi Michael,

Thank you for the awesome feedback! We’re glad to hear you’re happy with the Solar Panels from Jackery. Stay blessed and Happy holidays in advance.

Thank you for the awesome feedback! We’re glad to hear you’re happy with the Jackery Battery Pack 1000 Plus. If you ever have questions or need anything down the road, we’re always here to help.

Repeat offender

Gotcha with the title, I have purchased several items from OBP, like a repeat offender. I’m glad I stumbled across their website, every product I purchased has arrived on time and in great condition. As long as I have a need for their products, I will always be a customer, or repeat offender.

Hi Homer,

This made our day — we love the “repeat offender” title. Thank you for coming back to Outbound Power and for trusting us with multiple purchases. We’re glad everything has arrived on time and in great condition, every time.

We truly appreciate your loyalty and support, and we’ll be here whenever you’re ready for the next “offense.”

Thanks again for being such a great customer.
Best regards,
Bill

Fast delivery...competitive pricing.

I've been looking all over for this cable connector. So, kudos for actually having it in stock. Delivery was fast and the connector works great.

Hi T.R.,

Thank you for taking the time to leave a review — we really appreciate it. We’re glad we had the connector you were looking for and that it arrived quickly and worked exactly as expected.

Thanks again for choosing Outbound Power. Please don’t hesitate to reach out if you need anything else in the future.

Very well designed

I haven’t installed as of now but will edit and repost once installed.

Hi Jeffrey,

Thank you for the 5-star review! We’re glad to hear your first impression of the EcoFlow Smart Home Panel 3 has been a positive one so far. We look forward to hearing how the installation goes once everything is up and running.

If you have any questions or need assistance during setup, our team is always here to help.

Thanks again for choosing Outbound Power,
Bill & the Outbound Power Team

This is my second Delta Pro Ultra! Bought to expand our home backup. Both units are connected to the Smart Home Panel 2

Hi John,

Thank you so much for the incredible 5-star review — and for being a returning customer! We’re honored that you chose a second DELTA Pro Ultra to expand your home backup system. Connecting both units to the Smart Home Panel 2 is an excellent setup for maximizing reliability and whole-home coverage.

We truly appreciate your trust and support. If you ever need assistance optimizing your configuration or adding accessories, our team is always here to help.

Best Price In Town

I do lots of research and Outbound Power had the best deal on what I needed. Surprise surprise. It shipped from the same warehouse as the manufacturer and the warranty works exactly the same. Glad to have found the site.

Hi RG,
Thank you for the kind words! We’re glad your research led you to us and that everything worked out as expected—from pricing to shipping to warranty coverage. We truly appreciate your support and hope you enjoy your new battery pack.