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EcoFlow DELTA Pro 3 Smart Extra Battery — 4,096Wh LiFePO4 Expansion

Double Your Storage, Extend Your Independence

4,096Wh LiFePO4 storage — Doubles your DELTA Pro 3 runtime
4,000+ cycle lifespan — Automotive-grade LFP cells built for years
Plug-and-play connection — No wiring, no confusion, no guesswork
Smart app monitoring — Track every watt from your phone
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • Free Shipping -- Ships free on all orders, including LTL freight
  • Compatibility Guarantee -- Components pre-vetted to work together — we stand behind the architecture

$2,105.95

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EcoFlow DELTA Pro 3 Smart Extra Battery
EcoFlow DELTA Pro 3 Smart Extra Battery
$2,105.95

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In the box

  • DELTA Pro 3 Smart Extra Battery
  • EcoFlow Extra Battery Cable
  • Guides
EcoFlow DELTA Pro 3 Smart Extra Battery
EcoFlow DELTA Pro 3 Smart Extra Battery — 4,096Wh LiFePO4 Expansion
$2,105.95

Double Your Storage, Extend Your Independence

The EcoFlow DELTA Pro 3 Smart Extra Battery adds 4,096Wh of LiFePO4 capacity to your existing DELTA Pro 3 system through a simple plug-and-play connection. Built for off-grid and grid-independent setups, this expansion unit delivers over 4,000 charge cycles with automotive-grade LFP cells. Whether you're extending backup runtime at your homestead or sustaining a remote cabin through low-solar weeks, this battery is built-to-survive the demands of serious energy storage.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
LiFePO4 Chemistry
Plug-and-Play Setup
4,000+ Cycle Life
LED Array Display
4,096Wh
Usable Capacity
4,000+
Charge Cycles
33kg
Unit Weight
No Blackout Means No Problem

No Blackout Means No Problem

When the grid drops for four days, grid-tied solar systems go dark with it — leaving you exactly where you started. The DELTA Pro 3 Smart Extra Battery eliminates that vulnerability by adding 4,096Wh of off-grid proven LiFePO4 storage to your existing DELTA Pro 3 unit. Every component we carry at Off Grid Vault is pre-vetted for compatibility, so this expansion connects seamlessly without mismatched voltages or protocols that could leave you powerless when it matters. Automotive-grade LFP cells deliver over 4,000 cycles, giving you a decade of reliable backup that actually works when the utility fails.

Plug-and-Play Without the Guesswork

Plug-and-Play Without the Guesswork

Adding battery storage should not require an engineering degree or a weekend of trial-and-error wiring. The DELTA Pro 3 Smart Extra Battery connects directly to your main unit through a single cable — no voltage matching, no BMS configuration, no guessing whether your components will actually communicate. The included EcoFlow Extra Battery Cable handles the connection, and an LED array display gives you real-time status at a glance. For buyers who have researched their system and know exactly what they need, this is the expansion that respects your time and your technical standards. Charge temperatures range from 32°F to 113°F, so it performs across real-world conditions.

A Decade of Reliable Grid-Independent Power

A Decade of Reliable Grid-Independent Power

LiFePO4 chemistry is not a compromise — it is the standard for grid-independent storage. With over 4,000 charge cycles, this 4,096Wh expansion battery holds strong at 80% capacity long after lithium-ion alternatives have degraded. Automotive-grade LFP cells handle discharge temperatures from 14°F to 113°F and storage in the same range, so it survives the winters and summers that kill lesser batteries. Backed by a 5-year manufacturer warranty and Off Grid Vault's 30-day performance guarantee, this is the battery bank addition you build once and rely on for years. Monitor every watt through the EcoFlow app and know exactly where your off-grid power stands.

Compatibility Check

Make sure this expansion battery integrates with your setup before ordering.

  • You own an EcoFlow DELTA Pro 3 main unit
  • Operating temperature stays between 14°F and 113°F
  • You have floor space for a 694mm × 295mm × 215mm unit

Where This Battery Fits

Designed for serious power extension in real-world scenarios.

Home backup runtime extension
Off-grid cabin primary storage
Job site sustained power
Remote homestead energy reserve

Full specifications

At a glance

Dimensions
694mm*295mm*215mm
Surface
See product page
Warranty
5-year warranty
Full specifications13 data points across 4 categories

Dimensions

Dimensions694mm*295mm*215mm
Weight33kg

Power & Performance

Capacity4096Wh
Battery ChemistryLiFePO4 (LFP)
Output Port40V-58.4V=100A Max
Input Port40V-58.4V=80A Max
DisplayLED Array
Compatible withEcoFlow DELTA Pro 3

Materials

MaterialsSee product page

Compliance & Warranty

Warranty5-year warranty
Charge Temperature32°F~113°F
Discharge Temperature14°F~113°F
Storage Temperature14°F~113°F

The Off Grid Vault Promise

We stand behind every product we sell — because serious buyers deserve a serious store.

Free ShippingShips free on all orders, including LTL freight on large systems. No thresholds, no surprises.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Authorized Dealer SupportWarranty claims handled directly through us. You deal with people who understand off-grid power, not a ticket queue.
★★★★★
“I added two of these to my DELTA Pro 3 after a four-day outage left us running a gas generator nonstop. Now I have enough stored capacity to run my fridge, well pump, and lights for over two days without any sun or generator. The plug-and-play setup took me five minutes. Off Grid Vault's team confirmed compatibility before I ordered — no guesswork. This is the battery storage I wish I had bought first.”
F
First L.Prescott, AZ

DELTA Pro 3 Smart Extra Battery

The EcoFlow DELTA Pro 3 Smart Extra Battery is a high-capacity expansion unit designed to extend the runtime of the EcoFlow DELTA Pro 3 Portable Power Station. Featuring advanced LiFePO4 (LFP) battery technology, it offers a long lifespan of over 4,000 cycles, ensuring reliable and sustainable power for years. By seamlessly integrating with the DELTA Pro 3, this extra battery doubles the energy storage capacity, making it an ideal solution for home backup, off-grid living, and professional use.

It supports multiple charging methods, including solar, AC, and generator input, for maximum flexibility. With real-time monitoring and smart control via the EcoFlow app, users can easily track battery performance and optimize energy usage. Built for durability and efficiency, the DELTA Pro 3 Smart Extra Battery is the perfect addition for those needing extended power in any scenario.


EcoFlow DELTA Pro 3 Smart Extra Battery

DELTA Pro 3 Smart Extra Battery Specs

  • Capacity: 4096Wh
  • Output Port: 40V-58.4V=100A Max
  • Input Port: 40V-58.4V=80A Max
  • Dimensions: 694mm*295mm*215mm
  • Weight: 33kg
  • Compatible with: EcoFlow DELTA Pro 3
  • Discharge Temperature: 14°F~113°F
  • Storage Temperature: 14°F~113°F
  • Display: LED Array
  • Charge Temperature: 32°F~113°F
  • Included: DELTA Pro 3 Smart Extra Battery, EcoFlow Extra Battery Cable, and Guides


DELTA Pro 3 Smart Extra Battery Features

  • An Intelligent Subpanel For Outage Protection And Savings In One: The EcoFlow Smart Home Panel 2 is the center of your whole-home backup solution, working alongside EcoFlow DELTA Pro 3, generators, and solar panels to protect your home. With a fast, automatic switchover, you’ll have reliablebackup whenever needed. It allows you to customize your energy usage based on time-off-use rates and your home’s solar energy production.
  • Plug and Play: The smart extra batteries are easy to connect with the main unit of EcoFlow DELTA Pro 3. Enjoy a seamless, plug-and-play setup. The compact and portable design adds convenience to your power management.
  • Explore the Secure Feeling EcoFlow Brings to You: Built with state-of-the-art automotive-grade LFP cells for safe and reliable service. Our strong 5-year warranty ensures peace of mind.
  • Energize Every Moment That Needs Electricity: Power almost all your essential home appliances with the robust 4000W and dual 120V/240V capabilities of a single unit. Add extra batteries to extend the convenience even further.
  • Cutting-Edge Design, Sleek and Striking: Boosts portability with wider wheels, ergonomic handle, and a compact design. Perfect for dynamic lifestyles and maximizing family space.
  • Effortless All-in-One Command With the EcoFlow App: Control and monitor your home’s power remotely with ease using the EcoFlow app. Track every watt and customize your power usage for optimal efficiency.


Your Satisfaction with EcoFlow is Guaranteed:

  • 5-Year Limited Warranty
  • Lowest Price Guarantee

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Frequently Asked Questions

At 4,096Wh of LiFePO4 storage with over 4,000 cycles, this battery delivers decades of reliable capacity. If you are running 25 kWh/day and need extended autonomy during outages, adding this battery doubles your DELTA Pro 3 runtime — meaning your refrigerator, well pump, and lights stay on longer without generator fuel costs. The 5-year warranty and Off Grid Vault's 30-day performance guarantee protect that investment from day one. Finance with Affirm and pay as low as $175/month.
Unlike generic marketplace listings, every product at Off Grid Vault is vetted for build quality and real-world performance. We are an authorized dealer, so warranty claims go through us — not a ticket queue. If something fails, you deal with people who understand off-grid systems, not a returns bot. Our free system design consultation ensures this expansion battery is the right fit for your DELTA Pro 3 setup before you spend a dime.
The standalone DELTA Pro 3 delivers strong output, but runtime is limited by its internal capacity. If your goal is multi-day backup or true off-grid independence, one unit may not cover your 24-hour consumption — especially with a well pump and refrigerator running simultaneously. This 4,096Wh expansion doubles your stored energy, giving you more days of autonomy when the sun is not shining or the grid is down. Our engineers can size your exact needs through a free consultation.
LiFePO4 delivers significantly longer cycle life — over 4,000 cycles at 80% capacity retention versus roughly 500–1,000 for standard lithium-ion. It also handles higher temperatures, has a lower thermal runaway risk, and maintains stable voltage throughout discharge. For off-grid and backup applications where reliability over years matters, LiFePO4 is the chemistry serious builders choose. This battery uses automotive-grade LFP cells and operates from 14°F to 113°F in discharge and storage.
This Smart Extra Battery is designed specifically for the EcoFlow DELTA Pro 3. It is not compatible with DELTA Pro, DELTA 2, or other EcoFlow units. The connection uses a proprietary cable and communication protocol between the main unit and expansion battery. If you are unsure which system you have or are planning a build, contact us for a free system design consultation — we will make sure every component in your setup is matched correctly.
The DELTA Pro 3 supports multiple Smart Extra Battery connections, allowing you to scale your storage as your needs grow. Each unit adds 4,096Wh, so two extra batteries triple your base capacity. This modular approach means you can start with one expansion now and add more later without replacing your core system. Financing through Affirm lets you spread the cost over time rather than paying for everything upfront. Reach out to our team for help sizing the right configuration.
SKU: EFDELTAPRO3EB Category: Brand:

The Off Grid Vault Promise

We stand behind every product we sell — because serious buyers deserve a serious store.

Free Shipping Ships free on all orders, including LTL freight on large systems. No thresholds, no surprises.
30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Authorized Dealer Support Warranty claims handled directly through us. You deal with people who understand off-grid power, not a ticket queue.

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About ecoflow Expansion Batteries

ecoflow is a trusted manufacturer of premium expansion batteries. OffGridVault is an authorized dealer offering the full ecoflow lineup with free delivery, price match guarantee, and expert support.

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