Skip to content
by EcoFlow

EcoFlow DELTA Pro 3600Wh Smart Extra Battery

EcoFlow DELTA Pro 3600Wh Smart Extra Battery

Save $224.99 Save $224.99
Original price $1,723.99
Original price $1,723.99 - Original price $1,723.99
Original price $1,723.99
Current price $1,499.00
$1,499.00 - $1,499.00
Current price $1,499.00
in stock, ready to be shipped

Free shipping with delivery betweenandOrder within

Free Shipping

Every Off Grid Stores Product Ships For Free

No Sales Tax

We Only Charge Sales Tax In Nevada And Florida

Authorized Dealer

We are authorized dealers of every brand on our website

5-Year Warranty

Off Grid Stores is an authorized retailer of EcoFlow products. Because of this, we pass on EcoFlow's manufacturer warranty to you.

Product Highlights
  • Expandable capacity- Increase the capacity of DELTA Pro with an extra 3600Wh.
  • Triple power at up to 30% lower cost-3-10kWhexpandable capacity to fit your energy storage needs. Add up to two DELTA Pro Extra Batteries to gain a capacity of 10.8kWh. And it's up to 30% more affordable than a power station of the same capacity.
  • 10-year lifespan with an LFP battery- Get 10 years of daily use until it hits 80% of its original capacity. Embrace the 3000+ charging cycles enabled by the LFP battery chemistry.
  • Easy to use- Plug-and-play without setup. And use the EcoFlow app to monitor and control the DELTA Pro Extra Battery.
Why Buy From Us?

- Help Support Small Family Owned Business

- Our Team Has Actual Knowledge Of Our Products

- You Will Talk To A Real Person In The USA When You Call

- We Guarantee To Match The Lowest Prices On The Internet

- Our Items Are Located In The USA

- We Actually Live Off-Grid Unlike Some Of Our Competitors

Best Price Guarantee

Shop with confidence, as we guarantee the best prices available.

If you come across an item at a lower price on a competitor's website, we'll gladly match it.

Simply contact our customer service chat before purchasing to redeem this exclusive offer.

Learn more by visiting our Best Price Guarantee page here.

Shipping & Handling Policy

We provide Free Shipping to the continental 48 United States only.

International shipping, as well as shipping to Alaska, Hawaii, US Protectorates, P.O. Boxes, APO, FPO, or DPO addresses, is NOT available.

Orders are typically processed and shipped from our warehouse within 1-3 Business Days (excluding weekends and holidays).

After leaving our warehouse, the expected delivery time is 3-4 Business Days, resulting in an average total shipping and handling time of 4-7 Business Days.

Learn more about our Shipping & Handling Policy here.

Returns & Refunds

While shopping at Off Grid Stores know that returns are a breeze! If you are not completely satisfied with your purchase, for any reason, you may return it to us within 30 Days of delivery for a refund.

If you would like to open up a return you can send us an email to with your name, order number, and reason for return.

To learn more about our Returns & Refunds Policy you can do so here.

EcoFlow DELTA Pro 3600Wh Smart Extra Battery

EcoFlow DELTA Pro 3600Wh Smart Extra Battery


Make it a triple.

Double or triple the capacity of your DELTA Pro to 7.2kWh or 10.8kWh. That’ll give you days of power for your essential appliances.


Charge anytime, anywhere.

DELTA Pro’s Smart Extra Battery benefits from all the charging methods DELTA Pro has, including 6500W MultiCharge.

That means you can charge anytime, anywhere as long as your extra battery is connected to DELTA Pro.

Once connected, they’ll charge/discharge in unison, keeping the battery percent level across both units.



Ready for any emergency.

When the going gets tough and you’re out of charge options, get a 1800W DC fast charge with EcoFlow Smart Generator (sold separately).

Just plug the generator directly into your extra battery via the port on the back.

This works even when disconnected from your DELTA Pro.



Stay informed.

The Smart Extra Battery sports a bright LCD screen on the front of the unit giving you all the info you need.

Output, input, remaining charge and time remaining. It’s all there. Need on the go info?

The EcoFlow app can tell you all that & a whole lot more.



EcoFlow DELTA Pro 3600Wh Smart Extra Battery
General Info
Net weight Approximately 38 kg (84 lbs)
Dimensions 635 × 285 × 416 mm (25 × 11.2 × 16.4 in)
Capacity 3,600Wh 48V
Input Port
Extra Battery Port Input 48V 3,200W Max
Output Port
Extra Battery Port Output 45V-54V 4,260W Max
Battery Info
Cell Chemistry LFP
Cycle Life 3,500 cycles to 80% + capacity
Protection Overload Protection, Over Temperature Protection, Short
Circuit protection, Low Temperature Protection, Low
Voltage Protection, Overcurrent Protection
Environmental Operating Temperature
Optimal Operating Temperature 20°C ~ 30°C
Discharging Temperature -10°C ~ 45°C
Charging Temperature 0°C ~ 45°C
Storage Temperature -10°C ~ 45°C (Optimal: 20°C ~ 30°C)


Delta Pro Smart Extra Battery

Delta Pro Smart Extra Battery

x 1

Delta Pro Extra Battery Cable

x 1

Handle Covers

x 2

Delta Pro Extra Battery User Manual

x 1

EcoFlow Warranty Card

x 1

Frequently Asked Questions

How many extra batteries can I use with DELTA Pro?

For each DELTA Pro unit, you can link an extra two batteries, bringing you up to 10.8kWh of capacity.

What Makes the Smart Extra Battery "Smart"?

DELTA Pro’s Smart Extra Battery can be monitored from the EcoFlow app, allowing you to monitor & control your batteries from afar.

Can I charge the extra battery independently of DELTA Pro?

Yes, you can when using the Smart Generator as part of your ecosystem. For other charging methods, you should connect your Smart Extra Battery to the DELTA Pro unit first.

How fast does the Smart Extra Battery charge?

The charge speed varies depending on your chosen charge method. But in short, it charges fast. The fastest way to charge is by utilizing MultiCharge to reach a 6500W charge speed. With that, you can charge both your DELTA Pro and the extra battery in <2 hours. And via a standard AC wall outlet, you can expect a full charge in 2.7 hours assuming your DELTA Pro unit is fully charged.

What battery does the product use?

High-quality LFP battery.

How do I know if the product is charging?

When it’s charging, the remaining charging time will be shown on the LCD Screen. Meanwhile, the charging indicator icon begins to rotate with the remaining battery percentage and the input power shown on the right of the circle.

How do I clean the product?

Please gently wipe it with a dry, soft, clean cloth or paper towel.

How do I store the product?

Before storing, please turn off the product first, and then store it in a dry, ventilated place at room temperature. Do not place it near water sources. For long-term storage, please discharge and recharge the product every three months to extend its battery life.

User Manuals & Files:

EcoFlow DELTA Pro 3600Wh Smart Extra Battery User Manual

Download Now >

Customer Reviews

Based on 4 reviews
Bob hoss
Delta pro

I have purchased 2Delta Pros and two smart batteries from this store. This gives me 14400 kwh storage. Also bought 10 solar panles and additional items to have back up power. Been using the delta Pro with one extra battery for about a year every day to off set power bill. I was able to save 60% off my summer bills and 35% from my winter bill. With this last battery I just bought I can't wait to see how much I save this year. I have a small home less then a 1000 sq. and my own well. This system works great for my needs. No issues. Works great. Great company to do business with. This cost me about $13,000. I'm a D.I.Y'er so saved on labor and built my own panel racks. Pretty simple plug and play. Customer for life.


We received our extra battery for the Delta Pro and had to upgrade our firmware. Had a few questions and were helped immediately. Thank You for the great service

Dave Alsobrook
Scotty I need more power, you got it captain !

Added my final 2 batteries to max out my Delta pro home back up system giving me a 21.6 kw total at a great price from my favorite store.

Bob hoss

This extra battery works great with the delta pro providing me a combined 7200 watts. Easy set up. Love it.