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EcoFlow DELTA 3 Max Plus Smart Extra Battery front view showing expansion port cover and stackable design

EcoFlow DELTA 3 Max Plus Smart Extra Battery 2048Wh (LFP) | NZ Stock

by EcoFlow
Save $30.00
$2,389.00
$2,359.00

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✔ NZ Stocked

🛡 Official Warranty

📞 Need help? 0800 464 664

Description
🔋 Expandable capacity for longer runtime

EcoFlow DELTA 3 Max Plus Smart Extra Battery — +2048Wh Expansion

Add a full 2048Wh of extra storage to your DELTA 3 Max Plus for longer backup time and more off-grid runtime. It’s true plug-and-play—no setup—plus you can monitor charge level and temperature via the EcoFlow app.

Added capacity: 2048Wh Chemistry: LFP (LiFePO₄) Weight: 16kg (approx) Size: 494 × 239 × 196mm Plug-and-play App monitoring

Best for

  • Longer outages: keep essentials running for longer without changing your setup
  • Off-grid cabins: extend runtime overnight (lights, fridge, devices)
  • Worksites: more days of charging tools & running lights between recharges
  • Future-proofing: start with a base unit now, expand later

Simple logic: same inverter power, but much longer runtime.

 🔌 Plug-and-play

No install or wiring—connect to your DELTA 3 Max Plus for instant extra storage.

 📱 Smart monitoring

View charge level, status and temperature via the EcoFlow app.

 🛡️ Full-tab LFP cells

Automotive-grade full-tab LFP cell design for efficient, reliable long-life performance.

Key Specs (Quick Reference)

Rated capacity 2048Wh (51.2V, 40Ah)
Cell chemistry LFP (LiFePO₄)
Net weight 16kg ±0.4kg
Dimensions 494 × 239 × 196mm
Input 43.2–57.6V, 48A
Output 43.2–57.6V, 100A
Charge temperature 0°C to 45°C
Discharge temperature -10°C to 45°C
Storage temperature -10°C to 45°C
Compatibility EcoFlow DELTA 3 Max Plus (and select EcoFlow ecosystem products)
Warranty Up to 5 years (app registration required for extension)

Note: DELTA 3 Max Plus has a single extra battery port. To connect two Smart Extra Batteries, an expansion adapter may be required (EcoFlow accessory).

Why Add the Extra Battery?

With Extra Battery
  • Much longer runtime for the same appliances
  • Fewer recharges (AC/solar/vehicle) on multi-day use
  • Better off-grid comfort—run longer into the evening
  • Scales with you as needs grow
 Without Extra Battery
  • Great performance, but shorter runtime
  • More frequent charging needed
  • Less buffer for bad weather / low solar days
  • Less flexibility as your load list grows
 Simple rule: If you’re running out of power before you’re running out of jobs/daylight, add the Extra Battery.
If you’re hitting inverter limits (wattage) rather than runtime, you need a bigger base unit—not more batteries.

FAQ

What does this extra battery do?

It adds 2048Wh of additional energy storage to your DELTA 3 Max Plus—so you can run the same devices for longer. (It doesn’t increase inverter wattage; it increases runtime.)

Is it hard to install?

No—this is plug-and-play. Connect it to the extra battery port and monitor the system via the EcoFlow app.

Can I add more than one extra battery?

DELTA 3 Max Plus has one extra battery port. EcoFlow supports connecting up to two Smart Extra Batteries via an expansion adapter accessory.

Does it work on its own?

No. This Smart Extra Battery is designed to be used while connected to a compatible EcoFlow power station.

What’s the warranty?

EcoFlow lists up to a 5-year warranty, with app registration required for the extended portion.

Want help sizing runtime? Send us what you want to run + how long per day and we’ll sanity-check it before you buy.

In the Box

  • DELTA 3 Max Plus Smart Extra Battery × 1
  • Extra Battery Cable × 1
  • Manuals & Warranty Card × 1
Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at The Off Grid Store.

We can deliver to almost anywhere in New Zealand, unfortunately there are a few exceptions such as Chatham Islands and for larger items and Great Barrier Island. Best prices online guaranteed.

30 Day Easy Returns. Not happy with your product, we'll take it back no
questions asked.
Great Service. We pride ourselves on the best service, anywhere.
Your Satisfaction Guaranteed. We handpick our products for quality, we
know you'll love them. But if there is ever something wrong, we'll fix it.

Shipping

Shipping

Description
🔋 Expandable capacity for longer runtime

EcoFlow DELTA 3 Max Plus Smart Extra Battery — +2048Wh Expansion

Add a full 2048Wh of extra storage to your DELTA 3 Max Plus for longer backup time and more off-grid runtime. It’s true plug-and-play—no setup—plus you can monitor charge level and temperature via the EcoFlow app.

Added capacity: 2048Wh Chemistry: LFP (LiFePO₄) Weight: 16kg (approx) Size: 494 × 239 × 196mm Plug-and-play App monitoring

Best for

  • Longer outages: keep essentials running for longer without changing your setup
  • Off-grid cabins: extend runtime overnight (lights, fridge, devices)
  • Worksites: more days of charging tools & running lights between recharges
  • Future-proofing: start with a base unit now, expand later

Simple logic: same inverter power, but much longer runtime.

 🔌 Plug-and-play

No install or wiring—connect to your DELTA 3 Max Plus for instant extra storage.

 📱 Smart monitoring

View charge level, status and temperature via the EcoFlow app.

 🛡️ Full-tab LFP cells

Automotive-grade full-tab LFP cell design for efficient, reliable long-life performance.

Key Specs (Quick Reference)

Rated capacity 2048Wh (51.2V, 40Ah)
Cell chemistry LFP (LiFePO₄)
Net weight 16kg ±0.4kg
Dimensions 494 × 239 × 196mm
Input 43.2–57.6V, 48A
Output 43.2–57.6V, 100A
Charge temperature 0°C to 45°C
Discharge temperature -10°C to 45°C
Storage temperature -10°C to 45°C
Compatibility EcoFlow DELTA 3 Max Plus (and select EcoFlow ecosystem products)
Warranty Up to 5 years (app registration required for extension)

Note: DELTA 3 Max Plus has a single extra battery port. To connect two Smart Extra Batteries, an expansion adapter may be required (EcoFlow accessory).

Why Add the Extra Battery?

With Extra Battery
  • Much longer runtime for the same appliances
  • Fewer recharges (AC/solar/vehicle) on multi-day use
  • Better off-grid comfort—run longer into the evening
  • Scales with you as needs grow
 Without Extra Battery
  • Great performance, but shorter runtime
  • More frequent charging needed
  • Less buffer for bad weather / low solar days
  • Less flexibility as your load list grows
 Simple rule: If you’re running out of power before you’re running out of jobs/daylight, add the Extra Battery.
If you’re hitting inverter limits (wattage) rather than runtime, you need a bigger base unit—not more batteries.

FAQ

What does this extra battery do?

It adds 2048Wh of additional energy storage to your DELTA 3 Max Plus—so you can run the same devices for longer. (It doesn’t increase inverter wattage; it increases runtime.)

Is it hard to install?

No—this is plug-and-play. Connect it to the extra battery port and monitor the system via the EcoFlow app.

Can I add more than one extra battery?

DELTA 3 Max Plus has one extra battery port. EcoFlow supports connecting up to two Smart Extra Batteries via an expansion adapter accessory.

Does it work on its own?

No. This Smart Extra Battery is designed to be used while connected to a compatible EcoFlow power station.

What’s the warranty?

EcoFlow lists up to a 5-year warranty, with app registration required for the extended portion.

Want help sizing runtime? Send us what you want to run + how long per day and we’ll sanity-check it before you buy.

In the Box

  • DELTA 3 Max Plus Smart Extra Battery × 1
  • Extra Battery Cable × 1
  • Manuals & Warranty Card × 1
Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at The Off Grid Store.

We can deliver to almost anywhere in New Zealand, unfortunately there are a few exceptions such as Chatham Islands and for larger items and Great Barrier Island. Best prices online guaranteed.

30 Day Easy Returns. Not happy with your product, we'll take it back no
questions asked.
Great Service. We pride ourselves on the best service, anywhere.
Your Satisfaction Guaranteed. We handpick our products for quality, we
know you'll love them. But if there is ever something wrong, we'll fix it.

Shipping

Shipping