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

Double Your Storage for True Off-Grid Independence

4,096Wh LiFePO4 Capacity — Automotive-grade LFP cells for 4,000+ cycles
Plug-and-Play Expansion — Connects directly to DELTA Pro 3, no rewiring
Real-Time Monitoring — Track every watt through the EcoFlow app
Wide Temperature Range — Operates from 14°F to 113°F reliably
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • Compatibility Guarantee -- Pre-vetted to work with DELTA Pro 3 — we stand behind it

$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 for True Off-Grid Independence

The DELTA Pro 3 Smart Extra Battery adds 4,096Wh of LiFePO4 capacity to your existing EcoFlow DELTA Pro 3 power station — plug-and-play, no rewiring required. Built with automotive-grade LFP cells rated for over 4,000 charge cycles, this expansion unit delivers field-tested reliability for grid-independent living. Whether you're extending home backup runtime or building an off-grid proven energy system, this battery integrates seamlessly via the EcoFlow app for real-time monitoring and smart control. Ships free.

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
4,096Wh LiFePO4
4,000+ Cycle Life
Plug-and-Play Setup
Ships Free
4,096Wh
Usable Capacity
33kg
Unit Weight
5 Years
Warranty Coverage
No Guesswork, Just Compatible Power

No Guesswork, Just Compatible Power

Not a random battery pulled from a marketplace listing. The DELTA Pro 3 Smart Extra Battery is a factory-engineered expansion module designed to communicate directly with your DELTA Pro 3 unit — no voltage mismatches, no BMS protocol conflicts, no hoping it works. At Off Grid Vault, we only carry components we would install on our own cabins, and every expansion unit we sell is pre-vetted for compatibility with the base system. You plug it in and it works. That is the entire point of buying from a specialized retailer instead of piecing together components from five different vendors and crossing your fingers.

LiFePO4 Chemistry Built for Real Conditions

LiFePO4 Chemistry Built for Real Conditions

Automotive-grade LiFePO4 cells are the reason this battery survives where others fail. With over 4,000 charge cycles and a rated discharge range from 14°F to 113°F, the DELTA Pro 3 Smart Extra Battery handles real conditions — not just lab-tested averages. This is field-tested chemistry: no thermal runaway risk, no memory effect, and capacity retention that keeps you powered for years instead of months. Pair this expansion battery with your DELTA Pro 3 and you are looking at an off-grid proven energy bank that holds its rated 4,096Wh through seasons of actual use, not just the first week out of the box.

Smart Monitoring Meets Practical Portability

Smart Monitoring Meets Practical Portability

The EcoFlow app gives you command over every watt flowing through your expanded system. Monitor charge state, input sources, and output draw in real time from your phone — no walking outside to check an LED display. The DELTA Pro 3 Smart Extra Battery weighs 33kg and rolls on wider wheels with an ergonomic handle, so repositioning your power bank is not a two-person job. Whether you are extending backup runtime for a multi-day outage or scaling your remote cabin system, the combination of smart monitoring and physical portability means you stay in control without sacrificing convenience.

Compatibility Check

Confirm this expansion battery works with your setup before ordering.

  • Currently own an EcoFlow DELTA Pro 3 power station
  • Storage space measures at least 694mm × 295mm × 215mm
  • Operating environment stays within 14°F to 113°F

Where This Battery Delivers

Real-world scenarios where extra capacity changes everything.

Home Backup Extension
Off-Grid Cabin Power
Solar-Rated Storage

Full Specifications

At a glance

Dimensions
694mm*295mm*215mm
Warranty
5 Years
Full specifications11 data points across 4 categories

Dimensions

Dimensions694mm*295mm*215mm
Weight33kg

Power & Performance

Capacity4096Wh
Output Port40V-58.4V=100A Max
Input Port40V-58.4V=80A Max
DisplayLED Array

Materials

Battery ChemistryLiFePO4 (LFP)

Compliance & Warranty

Warranty5 Years
Charge Temperature32°F~113°F
Discharge Temperature14°F~113°F
Storage Temperature14°F~113°F

The Off Grid Vault Promise

What you get when you buy from us instead of a generic marketplace.

30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Free ShippingShips free on all orders, including LTL freight on large systems — no surprise charges.
Authorized Dealer SupportWarranty claims handled directly through us. Real people, not a ticket queue.
★★★★★
“I paired this with my DELTA Pro 3 for my 800 sq ft cabin in northern Arizona. Running about 12 kWh/day through lights, fridge, well pump, and a small window unit. With the extra battery, I went from anxious sun-down shutdowns to genuine all-night confidence. Plug-and-play — connected the cable, saw it recognized in the app within seconds. No fiddling with settings. This is the second expansion battery I have bought from Off Grid Vault and both arrived well-packaged with zero damage. The 33kg weight is manageable with the wheels if you need to reposition.”
M
Marcus L.Flagstaff, 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 $2,105, this expansion battery adds 4,096Wh of LiFePO4 storage to your system — capacity that would cost significantly more if built from individual cells and a DIY BMS. If your home backup runs $250 per month in avoided spoiled food, hotel stays, and equipment damage during outages, this battery pays for itself in under nine months of a single extended outage season. This is not a decorative add-on. It is rated capacity you can depend on.
Yes. The DELTA Pro 3 Smart Extra Battery is engineered exclusively for the EcoFlow DELTA Pro 3 power station. It uses a dedicated connection cable included in the box, so there is no wiring guesswork or voltage mismatch risk. At Off Grid Vault, we verify compatibility before listing any expansion component. If you own a DELTA Pro 3, this battery will connect and communicate with the base unit's BMS immediately. No adapters, no configuration changes, no troubleshooting.
Runtime depends entirely on your load, but here is a practical reference: a standard refrigerator draws roughly 150W running, so 4,096Wh keeps it cold for approximately 27 hours on this battery alone. Add your DELTA Pro 3 base unit and you are looking at 50+ hours of fridge runtime. For a cabin running LED lights, a well pump, and modest electronics at around 500W continuous, expect roughly 8 hours of additional autonomy. Tell us your actual consumption and we will calculate exact runtime during your free system design consultation.
The automotive-grade LiFePO4 cells inside this battery are rated for over 4,000 charge cycles. That means if you cycle it once per day, you are looking at more than a decade of service before capacity drops to 80% of original rating. LiFePO4 chemistry also operates safely across a wide temperature band — 14°F to 113°F for both discharge and storage. Unlike lithium-ion or NMC cells, LFP does not degrade rapidly under partial state-of-charge conditions, which is exactly how most backup systems actually get used.
The DELTA Pro 3 supports daisy-chaining multiple Smart Extra Batteries for expanded capacity. Each additional unit adds another 4,096Wh to your total energy bank. The exact number of batteries you can connect depends on your specific DELTA Pro 3 firmware version and configuration, so contact us before ordering multiple units. We will confirm your base unit's expansion limits and make sure you get the right number of batteries for your target autonomy — no over-ordering, no surprises.
EcoFlow provides a 5-year warranty on the DELTA Pro 3 Smart Extra Battery. As an authorized dealer, Off Grid Vault handles warranty claims directly — you do not get routed to a third-party ticket queue or an overseas call center. If a cell fails or the battery does not perform to its rated specifications within that warranty period, we process the claim on your behalf. That is the difference between buying from a specialized off-grid retailer and a generic marketplace.
SKU: EFDELTAPRO3EB Category: Brand:

The Off Grid Vault Promise

What you get when you buy from us instead of a generic marketplace.

30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Free Shipping Ships free on all orders, including LTL freight on large systems — no surprise charges.
Authorized Dealer Support Warranty claims handled directly through us. Real people, 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.

View all ecoflow products →

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