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EcoFlow DELTA 3 Max Plus Smart Extra Battery

🔥 On Sale! Promo is only until September 30th

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Authorized EcoFlow Dealer
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Availability: In Stock. Secure Your Order TODAY!
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SKU: EFD3MP-EB
  • Free Shipping & No Tax!
  • Ships in 1-5 Business Days
  • Up to 24-Hour Blackout Runtime with 2 Batteries
  • Industry-Leading X-Stream Fast Charging
  • Long-Lasting LFP Battery Tech (10+ Year Lifespan)
  • Sustainable Solar-Ready Power Anywhere
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Master Any Outage or Adventure with the EcoFlow DELTA 3 Max Plus Smart Extra Battery

Don't let a power outage or a remote location keep you disconnected. Meet the EcoFlow DELTA 3 Max Plus Smart Extra Battery, the ultimate expansion module designed to double the runtime of your primary power station. Adding a massive 2048Wh of extra capacity, this smart battery ensures you always have juice when you need it most. Whether you’re setting up a rugged off-grid campsite, running professional tools on a job site, or looking for a reliable setup for home backup, pairing this unit with compatible EcoFlow Generators delivers whisper-quiet, fume-free power right at your fingertips.

EcoFlow DELTA 3 Max Plus Smart Extra Battery

Why You Need the EcoFlow DELTA 3 Max Plus Smart Extra Battery

When the grid goes down for days or you need sustained power entirely off the grid, standard battery capacities might not be enough. Instead of purchasing an entirely new power station, the Smart Extra Battery provides a cost-effective, plug-and-play solution to instantly scale your energy storage. Because it connects directly to your existing host unit, it requires zero setup or extra chargers, simply plug it in and immediately double your runtime for heavy appliances, internet routers, or camping gear.




EcoFlow DELTA 3 Max Plus Smart Extra Battery Key Features

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Features

Double Your Capacity

Adds 2048Wh of storage to your setup, instantly extending the runtime of your appliances and critical devices during prolonged outages.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Expansion

Plug-and-Play Setup

No configuration is required. Simply connect it to your compatible host power station using the included Extra Battery Cable, and the system will automatically detect, manage, and utilize the additional power.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Plug and Play

Automotive-Grade LFP Battery

Built with LiFePO4 (LFP) chemistry that provides improved thermal stability, enhanced safety, and an incredibly long lifespan of up to 3,000 cycles before dropping to 80% capacity.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Battery Chemistry

Broad Compatibility

Engineered to work seamlessly with the DELTA 3 Max Plus and DELTA 3 Ultra Plus, with future firmware updates unlocking support for the DELTA 3 and DELTA 3 Plus, as well as ecosystem products like the WAVE 2/3, Smart Generator 4000 (Dual Fuel), and 800W Alternator Charger.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Broad Compatibility

EcoFlow DELTA 3 Max Plus Smart Extra Battery Inclusions

(1) EcoFlow DELTA 3 Max Plus Smart Extra Battery, (1) Extra Battery Cable, Manuals and Warranty Card

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Inclusions

EcoFlow DELTA 3 Max Plus Smart Extra Battery Specs

  • Net Weight: 16kg ± 0.4kg
  • Dimensions (HWD): 494 × 239 × 196mm
  • Rated Capacity: 2048Wh 51.2V 40Ah
  • Cell Chemistry: LFP (LiFePO4)
  • Output Port: 43.2~57.6V, 100A
  • Input Port: 43.2~57.6V, 48A
  • Charge Temperature: 0°C to 45°C (32°F to 113°F)
  • Discharge Temperature: -10°C to 45°C (14°F to 113°F)
  • Storage Temperature: -10°C to 45°C (14°F to 113°F)
  • Warranty: 5-Year Warranty (*Includes 3-year standard warranty and 2-year extended warranty available upon EcoFlow App registration.)
EcoFlow DELTA 3 Max Plus Smart Extra Battery

Frequently Asked Questions

Can I use the Smart Extra Battery by itself?

No, this unit is not a standalone portable power station. It is an expansion module designed strictly to connect to and be managed by a compatible EcoFlow host power station or ecosystem product.

How do I charge the extra battery?

The extra battery charges automatically whenever it is connected to a compatible EcoFlow power station that is receiving power. You simply plug your main power station into an AC outlet, solar panel, or generator, and both units will charge.

Which devices is this battery compatible with?

It natively supports the DELTA 3 Max Plus and DELTA 3 Ultra Plus. With upcoming firmware releases, it will also support the DELTA 3, DELTA 3 Plus, WAVE 2/3 air conditioners, the 800W Alternator Charger, and the Smart Generator 4000 (Dual Fuel).

A Brief Overview of the U.S. Home Energy Tax Credit

Discover the financial advantages of the U.S. federal solar tax credit for homeowners considering installing a solar system in their main residence. This incentive provides a 30% discount on the current cost of a solar system. If you've set up a system in 2022, it's advisable to speak with your tax consultant to see if you're eligible for a higher credit rate.

Understanding the U.S. Federal Solar Tax Credit:

This tax credit is tailored for homeowners and applies to solar systems installed in primary homes. The credit covers a percentage of qualifying expenses, and thanks to the recent Inflation Reduction Act, the scope of the Investment Tax Credit (ITC) has broadened. Solar systems installed from 2022 to 2032 are eligible for a 30% tax credit, which will drop to 26% in 2033 and 22% in 2034. There's no cap on the amount you can claim.

What Expenses Are Eligible:

Qualifying expenses include solar photovoltaic panels, attic fan power systems (except for the fan itself), labor costs for installation and setup, balance-of-system components, and applicable sales taxes. Standalone batteries with a capacity of 3 kWh or more may also be eligible! For instance, if the solar system you initially purchase includes a single battery with a capacity of less than 3 kWh, but you also buy extra batteries during the installation process that bring the total capacity to more than 3 kWh, then the entire setup may be eligible for the tax credit.

How to Determine Your Eligibility:

To confirm your eligibility for this federal solar credit, review the guidelines set forth by the U.S. Department of Energy and consult your tax advisor.

Steps to Claim the U.S. Federal Solar Tax Credit:

  1. Verify Eligibility: Speak with your tax advisor to confirm your eligibility and to understand how to make the most of the credit.

  2. Fill Out IRS Form 5695: This form, available online, is specifically for claiming renewable energy credits. Guidelines for completing the form are provided.

  3. Apply Credits on Your 1040: Use the total credit amount from Form 5695 to lessen your tax liability on your Form 1040.

Disclaimer:

Always consult your tax expert to fully understand your eligibility for tax credits based on your unique situation. Wild Oak Trail offers this guide for educational purposes and does not assure tax credits based on the information given. This resource should not replace professional tax or financial advice and should not be the only factor in your purchasing, investment, or tax choices. Consult a tax expert for a personalized evaluation.

Additional Resources:

EcoFlow Warranty Policy

Please note that the warranty period may vary according to local laws and regulations. Some countries, states, and provinces do not allow limitations on how long an implied warranty may last, so the limitation described above may not apply to you. You may have other rights from state to state, province, or country.

DO NOT USE YOUR PRODUCTS UNTIL YOU HAVE READ THE TERMS OF THE WARRANTY.

All EcoFlow products purchased come with a limited warranty, as shown below.

BY USING ECOFLOW PRODUCTS, YOU AGREE TO BE BOUND BY THE TERMS OF THE ECOFLOW LIMITED WARRANTY.

Wild Oak Trail provides a limited warranty for purchases according to EcoFlow's imposed warranty policy. The warranty period starts when the original purchaser receives the products.

WARRANTY TIMELINE

EcoFlow Warranty Timeline

Exclusions and Limitations

This warranty does not apply to:

· Non-quality related issues;

· Items purchased from outside of Wild Oak Trail;

· Purchases without valid proof of purchase;

· Items that have been refunded;

· Items that have expired their warranty period;

· Any defects or damages caused by misuse of products, unauthorized modification, dis-assembly or operation not in accordance with the official instructions or manuals;

· Any defects or damages caused by exposure to excessive heat, liquids or other external causes;

· Any defects or damages caused by reliability or compatibility issues when using unauthorized third-party parts;

· Lost or stolen products;

· Free products.

Cross-Regional After-Sales Service

Wild Oak Trail and EcoFlow does not provide a global product warranty, and the warranty service can only be obtained at a designated EcoFlow repair center.

To repair the product in an EcoFlow repair center when the product was purchased in another region, depending on part availability, customers can obtain a cross-regional repair service at an additional charge. (Some products do not support cross-regional repair even if the customer is willing to pay for the service. For more details, please contact Wild Oak Trail Customer Support.)

A cross-regional replacement service is not available for different versions of the same product.

The customer will need to bear customs duties, taxes, customs clearance, and other costs incurred for a cross-regional repair, regardless of whether it is the warranty or paid repair service. 

Valid Proof of Purchase

  • A purchase order number made through wildoaktrail.com;
  • Sales invoice or order confirmation email that clearly shows the description of the product, its price, and sales channel.

Return Material Authorization (RMA) process

  • Contact Wild Oak Trail Customer Support Team at customersupport@wildoaktrail.com or +1 (844)-945-3625.
  • If your item is eligible for an EcoFlow Warranty, you will receive a prepaid shipping label. Please follow the instructions provided by Dotti or Josh from Wild Oak Trail to properly pack the products and return them safely.
  • Please note that we can only provide return shipping labels for return packages in United States. 

Replacement 

  • In case of replacement, delivery of the replacement item will be arranged within 15 business days (subject to changes caused by force majeure) after confirming that the defective item has been received at our warehouse. The final resolution is subject to the availability of the replacement items.
  • The replacement warranty will be covered by a period equal to the remaining warranty period of the original item. 

Best Price Guarantee

You'll get the best price available at Wild Oak Trail! We'll match anyone who has it lower! 

We love to chat! Give us a call and we'll see what we can do to get you the best deal!

Conditions of our 100% Price Match Guarantee:

  • Contact us to discuss the Price Match so we can look up the competitors price

  • Buy one, get one free offers and Rebates are not eligible

  • The item must be in stock on the competitors website

  • The competitor must be an online store, not a retail location

  • The website can't be a discounter or auction website ( such as eBay, overstock, etc.)

  • The company must be an Authorized Retailer of the product in question

  • The Price Match Guarantee is based on the final price of the product including shipping and taxes

Why Buy From Wild Oak Trail? 

We’re a family-run business. My Wife Hailey and I run this business with our small staff of 3 awesome people. When you shop with Wild Oak Trail, you're supporting real people, not a big corporation.

We truly care. We’re here before, during, and after your purchase. Good products and great service—that’s how we earn your trust. We see and celebrate EVERY sale that comes in!

We choose quality. If we wouldn’t use it ourselves, we won’t offer it. Our goal is to make you happy enough to tell your friends.

Thanks for supporting our family and being part of the Wild Oak Trail community!

Description

Master Any Outage or Adventure with the EcoFlow DELTA 3 Max Plus Smart Extra Battery

Don't let a power outage or a remote location keep you disconnected. Meet the EcoFlow DELTA 3 Max Plus Smart Extra Battery, the ultimate expansion module designed to double the runtime of your primary power station. Adding a massive 2048Wh of extra capacity, this smart battery ensures you always have juice when you need it most. Whether you’re setting up a rugged off-grid campsite, running professional tools on a job site, or looking for a reliable setup for home backup, pairing this unit with compatible EcoFlow Generators delivers whisper-quiet, fume-free power right at your fingertips.

EcoFlow DELTA 3 Max Plus Smart Extra Battery

Why You Need the EcoFlow DELTA 3 Max Plus Smart Extra Battery

When the grid goes down for days or you need sustained power entirely off the grid, standard battery capacities might not be enough. Instead of purchasing an entirely new power station, the Smart Extra Battery provides a cost-effective, plug-and-play solution to instantly scale your energy storage. Because it connects directly to your existing host unit, it requires zero setup or extra chargers, simply plug it in and immediately double your runtime for heavy appliances, internet routers, or camping gear.




EcoFlow DELTA 3 Max Plus Smart Extra Battery Key Features

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Features

Double Your Capacity

Adds 2048Wh of storage to your setup, instantly extending the runtime of your appliances and critical devices during prolonged outages.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Expansion

Plug-and-Play Setup

No configuration is required. Simply connect it to your compatible host power station using the included Extra Battery Cable, and the system will automatically detect, manage, and utilize the additional power.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Plug and Play

Automotive-Grade LFP Battery

Built with LiFePO4 (LFP) chemistry that provides improved thermal stability, enhanced safety, and an incredibly long lifespan of up to 3,000 cycles before dropping to 80% capacity.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Battery Chemistry

Broad Compatibility

Engineered to work seamlessly with the DELTA 3 Max Plus and DELTA 3 Ultra Plus, with future firmware updates unlocking support for the DELTA 3 and DELTA 3 Plus, as well as ecosystem products like the WAVE 2/3, Smart Generator 4000 (Dual Fuel), and 800W Alternator Charger.

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Broad Compatibility

EcoFlow DELTA 3 Max Plus Smart Extra Battery Inclusions

(1) EcoFlow DELTA 3 Max Plus Smart Extra Battery, (1) Extra Battery Cable, Manuals and Warranty Card

EcoFlow DELTA 3 Max Plus Smart Extra Battery - Inclusions

EcoFlow DELTA 3 Max Plus Smart Extra Battery Specs

  • Net Weight: 16kg ± 0.4kg
  • Dimensions (HWD): 494 × 239 × 196mm
  • Rated Capacity: 2048Wh 51.2V 40Ah
  • Cell Chemistry: LFP (LiFePO4)
  • Output Port: 43.2~57.6V, 100A
  • Input Port: 43.2~57.6V, 48A
  • Charge Temperature: 0°C to 45°C (32°F to 113°F)
  • Discharge Temperature: -10°C to 45°C (14°F to 113°F)
  • Storage Temperature: -10°C to 45°C (14°F to 113°F)
  • Warranty: 5-Year Warranty (*Includes 3-year standard warranty and 2-year extended warranty available upon EcoFlow App registration.)
EcoFlow DELTA 3 Max Plus Smart Extra Battery

Frequently Asked Questions

Can I use the Smart Extra Battery by itself?

No, this unit is not a standalone portable power station. It is an expansion module designed strictly to connect to and be managed by a compatible EcoFlow host power station or ecosystem product.

How do I charge the extra battery?

The extra battery charges automatically whenever it is connected to a compatible EcoFlow power station that is receiving power. You simply plug your main power station into an AC outlet, solar panel, or generator, and both units will charge.

Which devices is this battery compatible with?

It natively supports the DELTA 3 Max Plus and DELTA 3 Ultra Plus. With upcoming firmware releases, it will also support the DELTA 3, DELTA 3 Plus, WAVE 2/3 air conditioners, the 800W Alternator Charger, and the Smart Generator 4000 (Dual Fuel).

Federal Solar Tax Credit

A Brief Overview of the U.S. Home Energy Tax Credit

Discover the financial advantages of the U.S. federal solar tax credit for homeowners considering installing a solar system in their main residence. This incentive provides a 30% discount on the current cost of a solar system. If you've set up a system in 2022, it's advisable to speak with your tax consultant to see if you're eligible for a higher credit rate.

Understanding the U.S. Federal Solar Tax Credit:

This tax credit is tailored for homeowners and applies to solar systems installed in primary homes. The credit covers a percentage of qualifying expenses, and thanks to the recent Inflation Reduction Act, the scope of the Investment Tax Credit (ITC) has broadened. Solar systems installed from 2022 to 2032 are eligible for a 30% tax credit, which will drop to 26% in 2033 and 22% in 2034. There's no cap on the amount you can claim.

What Expenses Are Eligible:

Qualifying expenses include solar photovoltaic panels, attic fan power systems (except for the fan itself), labor costs for installation and setup, balance-of-system components, and applicable sales taxes. Standalone batteries with a capacity of 3 kWh or more may also be eligible! For instance, if the solar system you initially purchase includes a single battery with a capacity of less than 3 kWh, but you also buy extra batteries during the installation process that bring the total capacity to more than 3 kWh, then the entire setup may be eligible for the tax credit.

How to Determine Your Eligibility:

To confirm your eligibility for this federal solar credit, review the guidelines set forth by the U.S. Department of Energy and consult your tax advisor.

Steps to Claim the U.S. Federal Solar Tax Credit:

  1. Verify Eligibility: Speak with your tax advisor to confirm your eligibility and to understand how to make the most of the credit.

  2. Fill Out IRS Form 5695: This form, available online, is specifically for claiming renewable energy credits. Guidelines for completing the form are provided.

  3. Apply Credits on Your 1040: Use the total credit amount from Form 5695 to lessen your tax liability on your Form 1040.

Disclaimer:

Always consult your tax expert to fully understand your eligibility for tax credits based on your unique situation. Wild Oak Trail offers this guide for educational purposes and does not assure tax credits based on the information given. This resource should not replace professional tax or financial advice and should not be the only factor in your purchasing, investment, or tax choices. Consult a tax expert for a personalized evaluation.

Additional Resources:

EcoFlow Warranty

EcoFlow Warranty Policy

Please note that the warranty period may vary according to local laws and regulations. Some countries, states, and provinces do not allow limitations on how long an implied warranty may last, so the limitation described above may not apply to you. You may have other rights from state to state, province, or country.

DO NOT USE YOUR PRODUCTS UNTIL YOU HAVE READ THE TERMS OF THE WARRANTY.

All EcoFlow products purchased come with a limited warranty, as shown below.

BY USING ECOFLOW PRODUCTS, YOU AGREE TO BE BOUND BY THE TERMS OF THE ECOFLOW LIMITED WARRANTY.

Wild Oak Trail provides a limited warranty for purchases according to EcoFlow's imposed warranty policy. The warranty period starts when the original purchaser receives the products.

WARRANTY TIMELINE

EcoFlow Warranty Timeline

Exclusions and Limitations

This warranty does not apply to:

· Non-quality related issues;

· Items purchased from outside of Wild Oak Trail;

· Purchases without valid proof of purchase;

· Items that have been refunded;

· Items that have expired their warranty period;

· Any defects or damages caused by misuse of products, unauthorized modification, dis-assembly or operation not in accordance with the official instructions or manuals;

· Any defects or damages caused by exposure to excessive heat, liquids or other external causes;

· Any defects or damages caused by reliability or compatibility issues when using unauthorized third-party parts;

· Lost or stolen products;

· Free products.

Cross-Regional After-Sales Service

Wild Oak Trail and EcoFlow does not provide a global product warranty, and the warranty service can only be obtained at a designated EcoFlow repair center.

To repair the product in an EcoFlow repair center when the product was purchased in another region, depending on part availability, customers can obtain a cross-regional repair service at an additional charge. (Some products do not support cross-regional repair even if the customer is willing to pay for the service. For more details, please contact Wild Oak Trail Customer Support.)

A cross-regional replacement service is not available for different versions of the same product.

The customer will need to bear customs duties, taxes, customs clearance, and other costs incurred for a cross-regional repair, regardless of whether it is the warranty or paid repair service. 

Valid Proof of Purchase

  • A purchase order number made through wildoaktrail.com;
  • Sales invoice or order confirmation email that clearly shows the description of the product, its price, and sales channel.

Return Material Authorization (RMA) process

  • Contact Wild Oak Trail Customer Support Team at customersupport@wildoaktrail.com or +1 (844)-945-3625.
  • If your item is eligible for an EcoFlow Warranty, you will receive a prepaid shipping label. Please follow the instructions provided by Dotti or Josh from Wild Oak Trail to properly pack the products and return them safely.
  • Please note that we can only provide return shipping labels for return packages in United States. 

Replacement 

  • In case of replacement, delivery of the replacement item will be arranged within 15 business days (subject to changes caused by force majeure) after confirming that the defective item has been received at our warehouse. The final resolution is subject to the availability of the replacement items.
  • The replacement warranty will be covered by a period equal to the remaining warranty period of the original item. 
Best Price Guarantee!

Best Price Guarantee

You'll get the best price available at Wild Oak Trail! We'll match anyone who has it lower! 

We love to chat! Give us a call and we'll see what we can do to get you the best deal!

Conditions of our 100% Price Match Guarantee:

  • Contact us to discuss the Price Match so we can look up the competitors price

  • Buy one, get one free offers and Rebates are not eligible

  • The item must be in stock on the competitors website

  • The competitor must be an online store, not a retail location

  • The website can't be a discounter or auction website ( such as eBay, overstock, etc.)

  • The company must be an Authorized Retailer of the product in question

  • The Price Match Guarantee is based on the final price of the product including shipping and taxes

Why Buy From Us

Why Buy From Wild Oak Trail? 

We’re a family-run business. My Wife Hailey and I run this business with our small staff of 3 awesome people. When you shop with Wild Oak Trail, you're supporting real people, not a big corporation.

We truly care. We’re here before, during, and after your purchase. Good products and great service—that’s how we earn your trust. We see and celebrate EVERY sale that comes in!

We choose quality. If we wouldn’t use it ourselves, we won’t offer it. Our goal is to make you happy enough to tell your friends.

Thanks for supporting our family and being part of the Wild Oak Trail community!

EcoFlow Shipping Details

All EcoFlow generators, portable power stations, and accessories are processed and shipped directly from our U.S. warehouse partners within 2 to 5 business days after your order is confirmed. Once your order has been dispatched, you will receive a confirmation email containing your tracking number so you can monitor the delivery status easily.

We proudly offer FREE standard shipping on EcoFlow generator and power station orders throughout the continental United States. Estimated delivery times may vary due to carrier schedules, peak holiday periods, or unforeseen delays beyond our control.

Some larger units, bundles, or accessory kits may arrive in multiple packages. If this occurs, tracking information will be provided for each shipment so you can follow their progress.

Please ensure your shipping address is complete and accurate at checkout. Wild Oak Trail is not responsible for delays, lost packages, or delivery issues resulting from incorrect address information.

If you do not receive a tracking update within 7–10 business days after your order ships, please reach out to our team at customersupport@wildoaktrail.com so we can assist you.