For custom requirements or quote, please contact us through live chat or call us.

Bringing the Extra Battery for EcoFlow DELTA Max to give you the extra power.

Make it a triple.
Double or triple the capacity of DELTA Max to 4032Wh or 6048Wh, longer runtime for your key appliances

Charge anytime, anywhere. 
DELTA Max’s Smart Extra Battery benefits from all the charging methods DELTA Max has, which means you can charge anytime, anywhere as long as your extra battery is connected to DELTA Max. Once connected, they’ll charge/discharge in unison, keeping the battery percentage level across both units. 

Ready for any emergency. 
Get a 1800W DC fast charge with EcoFlow Smart Generator (sold separately). Just plug the generator directly into your extra battery via the extra battery port. This works even when disconnected from your DELTA Max. 

Stay informed. 
The Smart Extra Battery has a bright LCD screen on the front of the unit giving you all the info you need. Output, input, remaining charge and time remaining. 

 

All orders are shipped free of charge and are not subject to sales tax.

We only ship within United States.

We are unable to ship to Puerto Rico, Hawaii and Canada. 

We try to make the delivery process as simple as possible, and we can send your order either to your home or workplace. Unfortunately, we do not offer deliveries to PO boxes or parcel motels.

All orders ship from warehouse closest to the delivery address.

Warehouse Locations: California, Missouri, New Jersey, Georgia and Texas.

We use priority FedEx and USPS to ship items 

All orders are processed within 2-3 business days.

Delivery in 3-5 business days on average when not delayed by the freight company.

Orders are not shipped or delivered on weekends or holidays.

For a quote on express shipping rates, please feel free to reach out and we will be more than happy to help.

Note: Tracking information is available within 1-3 days after shipping. If you received a tracking number that is not working at the time you are trying, please check again within 24 hours before contacting us as it takes time to update the system, thank you!

 

We would accept returns if you notify us via email at support@delta-portablepowerstations.com within 30 days after your package had been delivered (according to the tracking information provided). If 30 days had gone by after your package was delivered, unfortunately, we would not be able to offer you a refund or exchange.

To be eligible for a return, your item must be in the same condition that it was in when you received it. It must also be in the original packaging and not used/opened.

In the rare case that a product becomes faulty or a buyer receives a product with defects, buyers are entitled to request a product replacement within 60 days of receiving the item. To request a replacement, buyers are required to provide photo/video evidence of the product's manufacturing defects via email at support@delta-portablepowerstations.com. If the case is deemed valid, we will cover the related cost to deliver a replacement!

**Please also include your invoice number/order number for us to match up your order in the system.

*** Please enclose in the return package your order info and state clearly if you would like a replacement or refund.

The following information is needed to process your request:

1) Your order number

2) The email address used to place the order

3) Reasons for return

Please send the above information to us via email at support@delta-portablepowerstations.com. You should also enclose it in your returned package for us to match your order. Without the information, we would not be able to identify and process your package.

Refunds (if applicable)
Once your return is received and inspected, we will notify you of the approval or rejection of your refund.

If approved, your refund would be processed, and a credit would be automatically applied to your credit card or original method of payment, you can expect a refund within 1-3 business days.

Any orders that are rejected by the customer for any reason other than damage in shipment or wrong items shipped must pay return shipping cost.

15% restocking fee may additionally be assessed for any refused product, damaged, returned, or otherwise. Furthermore, Delta - Portable Power Stations only accepts returns for unopened merchandise if customers decide to not use it.

For the return of US orders, we'll charge the transaction fee (2.6% for credit card users, 3.6% for PayPal users, 3.5% for Affirm users) + shipping cost. For quality issues, we will give you the full refund or one-time free replacement after you receive the goods.

After you returned the product to our warehouse, we'll issue the refund within 14 business days, you'll be notified with an email once your order is refunded.
If you don't receive the refund after 14 business days, please contact us via support@delta-portablepowerstations.com

 

Return Shipping Cost

We will charge you the shipping fee under these circumstances: 

  • If you cancel your order over 24 hours and within 30 days without any reasons, we'll charge the transaction fee (2.6% for credit card users, 3.6% for PayPal users) + shipping cost.
  • 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;
  • Any defects or damages caused by misuse of products, unauthorized modification, dis-assembly or operation not in accordance with the official instructions or manuals;
Product Shipping Cost
All products $100

 

DELTA Max Extra Battery (Boost to 4.03kWh or 6.5kWh)

The World's Fastest charging portable power station

Save 19% ($301.00)
Price:
Sale price$1,298.00 Regular price$1,599.00
Comes with 2 year warranty + 1 year exclusive extension when registered.
Color: Black
Type: 2000w

Get 6% OFF TODAY with code WINTER6

$200 OFF on Power Kits with code FULLPOWER

Free shipping. In stock. Delivered in 3-4 days.

  • Quality 24/7 Customer Support
  • No Added Sales Tax

For custom requirements or quote, please contact us through live chat or call us.

Bringing the Extra Battery for EcoFlow DELTA Max to give you the extra power.

Make it a triple.
Double or triple the capacity of DELTA Max to 4032Wh or 6048Wh, longer runtime for your key appliances

Charge anytime, anywhere. 
DELTA Max’s Smart Extra Battery benefits from all the charging methods DELTA Max has, which means you can charge anytime, anywhere as long as your extra battery is connected to DELTA Max. Once connected, they’ll charge/discharge in unison, keeping the battery percentage level across both units. 

Ready for any emergency. 
Get a 1800W DC fast charge with EcoFlow Smart Generator (sold separately). Just plug the generator directly into your extra battery via the extra battery port. This works even when disconnected from your DELTA Max. 

Stay informed. 
The Smart Extra Battery has a bright LCD screen on the front of the unit giving you all the info you need. Output, input, remaining charge and time remaining. 

 

All orders are shipped free of charge and are not subject to sales tax.

We only ship within United States.

We are unable to ship to Puerto Rico, Hawaii and Canada. 

We try to make the delivery process as simple as possible, and we can send your order either to your home or workplace. Unfortunately, we do not offer deliveries to PO boxes or parcel motels.

All orders ship from warehouse closest to the delivery address.

Warehouse Locations: California, Missouri, New Jersey, Georgia and Texas.

We use priority FedEx and USPS to ship items 

All orders are processed within 2-3 business days.

Delivery in 3-5 business days on average when not delayed by the freight company.

Orders are not shipped or delivered on weekends or holidays.

For a quote on express shipping rates, please feel free to reach out and we will be more than happy to help.

Note: Tracking information is available within 1-3 days after shipping. If you received a tracking number that is not working at the time you are trying, please check again within 24 hours before contacting us as it takes time to update the system, thank you!

 

We would accept returns if you notify us via email at support@delta-portablepowerstations.com within 30 days after your package had been delivered (according to the tracking information provided). If 30 days had gone by after your package was delivered, unfortunately, we would not be able to offer you a refund or exchange.

To be eligible for a return, your item must be in the same condition that it was in when you received it. It must also be in the original packaging and not used/opened.

In the rare case that a product becomes faulty or a buyer receives a product with defects, buyers are entitled to request a product replacement within 60 days of receiving the item. To request a replacement, buyers are required to provide photo/video evidence of the product's manufacturing defects via email at support@delta-portablepowerstations.com. If the case is deemed valid, we will cover the related cost to deliver a replacement!

**Please also include your invoice number/order number for us to match up your order in the system.

*** Please enclose in the return package your order info and state clearly if you would like a replacement or refund.

The following information is needed to process your request:

1) Your order number

2) The email address used to place the order

3) Reasons for return

Please send the above information to us via email at support@delta-portablepowerstations.com. You should also enclose it in your returned package for us to match your order. Without the information, we would not be able to identify and process your package.

Refunds (if applicable)
Once your return is received and inspected, we will notify you of the approval or rejection of your refund.

If approved, your refund would be processed, and a credit would be automatically applied to your credit card or original method of payment, you can expect a refund within 1-3 business days.

Any orders that are rejected by the customer for any reason other than damage in shipment or wrong items shipped must pay return shipping cost.

15% restocking fee may additionally be assessed for any refused product, damaged, returned, or otherwise. Furthermore, Delta - Portable Power Stations only accepts returns for unopened merchandise if customers decide to not use it.

For the return of US orders, we'll charge the transaction fee (2.6% for credit card users, 3.6% for PayPal users, 3.5% for Affirm users) + shipping cost. For quality issues, we will give you the full refund or one-time free replacement after you receive the goods.

After you returned the product to our warehouse, we'll issue the refund within 14 business days, you'll be notified with an email once your order is refunded.
If you don't receive the refund after 14 business days, please contact us via support@delta-portablepowerstations.com

 

Return Shipping Cost

We will charge you the shipping fee under these circumstances: 

  • If you cancel your order over 24 hours and within 30 days without any reasons, we'll charge the transaction fee (2.6% for credit card users, 3.6% for PayPal users) + shipping cost.
  • 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;
  • Any defects or damages caused by misuse of products, unauthorized modification, dis-assembly or operation not in accordance with the official instructions or manuals;
Product Shipping Cost
All products $100

 

Customer Reviews

Based on 9 reviews 5.0/
5
5
 
(9)
4
 
(0)
3
 
(0)
2
 
(0)
1
 
(0)
  • b
    brian selleck B. S. brian s. ca
    23-10-2022

    great

    I already gave you my feedback...please stop

  • H
    Herbert Johnson H. J. Herbert J. us
    15-07-2022

    Very good battery

    Simple and easy to set up had no problems so far works as it's supposed to

  • d
    donaldloriston D. donaldloriston
    06-05-2022

    Delta max One of the best ones on the market number one

    This item is very awesome I can’t complain what it is the best is the number one product in the world anybody who buy this you’ll be so happy.

  • A
    Amazon Customer A. C. Amazon C.
    14-04-2022

    Great

    Great product

  • J
    Joseph R. Donnaway J. R. D. Joseph R. D.
    16-02-2022

    Excellent design and performance. Expensive.

    Matches the Delta Max in appearance and connects simply with full control and data. Discharges / recharges in synch. Price should be lower than Delta Max, however, as it’s the same battery capacity yet lacks inverter, charger, outlets. Thus my lower rating for value.

  • h
    hugo dominguez H. D. hugo d.
    10-02-2022

    La mejor batería del mercado yo tengo un ac de 6000 watt y lo soporta tranquilamente . Lo recomiendo

    Lo mejor batería del mercado. Su carga rápida de 2 horas está 100 por ciento. Lo utilice para un aire acondicionado de 6000 btu lo utilice toda la noche . Y no se descargo completamente. También compre la extra batería. Lo mejor del mercado. Fue el único que me soluciono mi problema. Compré otra baterías y para recargarla duran 8 horas. Es mucho y me soportaba el ac solo 45 minutos. Ecoflow el mejor

  • Jose Santiago
    J
    Jose Santiago J. S. Jose S.
    14-01-2022

    say good bye to that loud gas-guzzling generator

    Had a large gas-guzzling Honda 7000/12000-watt generator that didn't have an electric start and was too loud to run in my current housing development. Not to mention it was a bear to set up and startup. Chronic back pain prohibits and limits my ability to set up and run this outdated and inefficient solution. So, I did some homework and found the ECOflow product line. I already owned the ECOFlow delta and using it as a temporary solution to keep my fridge, microwave and a few lights going during a power outage. Then ECOflow introduced the Delta Max and Delta Pro. I decided to purchase the Delta Max and 2ea additional smart batteries. My reason for this was product weight, product foot print and cost. The Delta Max solution was easy for me to move/transport and setup. At around 50 lbs or less for each module, I can easily move and setup this solar powered generator solution without wrenching my back. I now have a quiet, efficient Backup power during those unexpected power outages. With just the Delta Max I had around 4 hours of battery backup run-time. I am talking about powering every thing in my home except those devices that require 2-phase power. With 2 additional smart batteries I now expanded my capacity to 6kWh and have roughly 12 hours of runtime. I purchased 4ea Ecoflow 110 watt solar panels and plan to build a portable frame to put them in my front yard to charge up the batteries using solar power. In addition, I purchased a Generac 7117 Gp2200I W 50St Inverter generator that weights around 47 Lbs. It’s light and easy to move around. It’s very quiet and extremely gas efficient. I use it to charge up the solar generator batteries when there is not enough sun light. I live in the PNW so it’s not the sunniest place in the USA especially during the winter months. The Delta Max has a smartphone application that connects via bluetooth that I use to determine my power consumption, run-time remaining and many other aspects for controlling the solar generator environment, including doing firmware updates as required. One neat feature of the application is that I can control how much power the solar generators demands of the gas generator while recharging the batteries. The solar generator can demand as much as 1800 watts of power during a charge cycle. I like to limit this to 1300 watts. This lowers gas consumption and noise on the gas generator during a charge cycle. The Delta Max has the ability to provide 3400W of power with ease using X-Boost technology. This allows the concurrent use of power hungry device like microwave, fridge, heater, dish washer. ect… You can use the application to stay at or below the 3400W limitations. For me it was easly achieved. I even keep my bidets powered during power outages. I just put them in low power consumption mode. Do your homework and be smart. Determine your wattage requirements for all of the items you want to power up during a power outage and then determine the worst case aggregate power requirements and you’ll be able to determine what devices can run concurrently using the Delta Max during a prolonged power outage. Use this link to purchase a cable to connect the Delta max to your existing Generator power transfer switch: https://www.amazon.com/gp/product/B08H85RQ6X/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1 I really like and am impressed with the products that ECOflow manufacture. I am very tech savvy and a DYI guy so it wasn’t hard for me to research and integrate this product for a reliable and safe electrical backup solution. I haven’t had any issues using this solution during several outages since installing it. I haven’t had the need to call their tech support so I can’t comment on there abilities to support the product. I did my homework thought and it seems that they have their stuff together for good customer service and support.

  • W
    Will W. W. W. Will W.
    18-11-2021

    Smart purchase

    After weeks of researching and weighing the pros and cons of several of the top tier larger power stations, and after owning a Bluetti (MaxOak ac50s), I decided to spring for the EcoFlow Delta Max 1640. What swayed me? Quick charge capability Slightly lower overall weight Ergonomics of design for carrying Ability to daisy chain to increase total storage Key metrics screen App My only two reservations were the cycle limitation and the lower total run time as compared to the Bluetti (MaxOak eb240). My plan for this is to use in emergencies and for travel/outdoors so I’m not anticipating tons of cycles so I feel I’ll be good. Should arrive next week and I’ll update with add’l info.

  • john
    j
    john J. john
    20-10-2021

    Powers 90% of my house during outage!

    First off I just want to say Ecoflow max with the added battery is a sufficient power system to run 90% of my home on eight separate circuits. All the circuits are 20 A and with everything turned on running at once he can run my whole home without any external power source for 11 hours, that is absolutely amazing considering this is a battery and not any type of fossil fuel generator! I did purchase some 10 AWG cable and connect my MC four connectors to it to run to 1000 W of solar that I have outside. With the solar plugged in in a moderately sunny day I can be off grid for as long as I want! The only limiting factor is the ability to run any type of 220 V appliances. That is OK because most of my appliances are 110 and or gas/propane. The set up and warranty registration of these products were extremely easy utilizing the EcoFlow website and the EcoFlow app is equally good. It allows me to see the current usage input in output from my solar panels and what I am using in the house at the same time. I can regulate the power I use accordingly to increase the amount of time I have in battery storage. This is amazing technology and I cannot wait for the Ecoflow pro to be available so I will have the capability of running 220 V with two of these combined. Once that happens this will be a great tool for any prepper, homesteading, camping and outdoor fun. These things are light enough to carry around anywhere you need to go and powerful enough to power what you need. The other thing I like is that while you’re driving you can have these charging from your vehicle with the included DC 12 V plug to top them off if need be. I would highly recommend getting the EcoFlow max and an added battery or two if you really want to get serious. I’m extremely happy with the purchase and I will be purchasing more in the future from Ecoflow. They have great customer service and great support! PS, I also saved the foam packaging and used it to set my EcoFlow battery on instead of just putting it on the concrete it makes a great pad for the battery!

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DELTA Max Extra Battery (Boost to 4.03kWh or 6.5kWh)

$1,298.00