EcoFlow DELTA 3 Smart Extra Battery
Double compatible DELTA 3-family capacity with a 1,024Wh smart extra battery.
- 1,024Wh added capacity — doubles the base DELTA 3-family size in supported setups
- LFP battery chemistry — designed for long-cycle use
- 4,000+ cycle claim — listed by EcoFlow to 80% capacity
- Plug-and-play design — made for simple system integration
- EcoFlow app monitoring — visibility through the connected setup
Use with a compatible main unit. Compatibility should be checked before ordering.
Out of stock
Is this expansion battery right for you?
Good fit if:
- You own a compatible DELTA 3 or DELTA 3 Plus
- You want to double base battery capacity
- You want EcoFlow app visibility through the system
- You need longer runtime rather than more AC output
Not ideal if:
- You need standalone AC sockets
- You own the Classic model and need confirmed expansion support
- You want a separate portable power station
DELTA 3 Smart Extra Battery at a Glance
A Closer Look at the DELTA 3 Smart Extra Battery
This battery improves runtime, not output. The host DELTA 3 unit still provides the sockets, inverter, controls and charging management.
That distinction is useful for buyers: if your current DELTA 3 already powers the devices you need but runs down too quickly, the Smart Extra Battery is the right kind of upgrade.
Why it works for your setup
1,024Wh added capacity
doubles the base DELTA 3-family size in supported setups
LFP battery chemistry
designed for long-cycle use
4,000+ cycle claim
listed by EcoFlow to 80% capacity
Plug-and-play design
made for simple system integration
EcoFlow app monitoring
visibility through the connected setup
No standalone AC output
requires a compatible host station for mains appliances
Why Buy From VoltReady™
UK-Based Business
VoltReady is a UK-based portable-power specialist serving customers across the United Kingdom.
Manufacturer Warranty
Products include manufacturer-backed warranty cover, with the exact terms shown clearly on each product page.
Flexible Ways to Pay
Pay securely by card, Apple Pay, Google Pay, Klarna or Clearpay. Available options depend on your order and eligibility.
UK Customer Support
Get straightforward help before and after your purchase through live chat or email.
Everything important, clearly organised
Key Features
Technical Specifications
What’s in the Box
FAQs
Can this battery be used by itself?
No. It is an extra battery for compatible EcoFlow DELTA 3 systems, not a standalone AC power station.
How much capacity does it add?
It adds 1,024Wh to a compatible DELTA 3 or DELTA 3 Plus setup.
Does it increase AC output?
No. It extends runtime. AC output still comes from the host power station.
Can I monitor it in the app?
EcoFlow lists app monitoring and control through the DELTA 3 Smart Extra Battery system.
Is it right for DELTA 3 Classic?
Do not assume Classic compatibility. Check the exact host model before ordering.
Shipping, Returns & Warranty
Explore related power options
Compare compatible accessories, alternative power stations and useful charging options.
