EcoFlow Battery Compatibility Guide: Extra Battery & Expansion Options

Updated: August 18, 2026

Use the interactive lookups and full compatibility table matrix below to compare and determine officially verified combinations for EcoFlow systems and expansion batteries. Explore by power station (solar generator) or extra battery model.

My opinions, not under contract. Uses affiliate links. Brands send some review items. See details

Compatible Batteries by Power Station

Select EcoFlow model to view full battery compatibility details, port types, required adapters, expansion limits, and capacities.

View tables or check by battery model below

Use code MATANICH at EcoFlow for an extra 5% off! See details.

Full Compatibility Comparison Tables

Select any table item to view full compatibility details, required adapters, and purchase links. Combinations marked as Compatible or Needs add-on are officially verified by EcoFlow. See verification details. Tables scroll horizontally and vertically when needed.

DELTA Series Compatibility

DELTA Pro 3 Smart Extra Battery — EcoFlow DELTA Series Battery Compatibility

DELTA Pro Smart Extra Battery — EcoFlow DELTA Series Battery Compatibility

DELTA Pro Ultra Series Compatibility

DELTA Pro Ultra Series Smart Extra Battery — EcoFlow DELTA Pro Ultra Series Battery Compatibility

EcoFlow DELTA Pro Ultra Series Battery Compatibility

		DELTA Pro Ultra X is not compatible with DELTA Pro 3 Smart Extra Battery	DELTA Pro Ultra X is not compatible with DELTA Pro Smart Extra Battery
		DELTA Pro Ultra is not compatible with DELTA Pro 3 Smart Extra Battery	DELTA Pro Ultra is not compatible with DELTA Pro Smart Extra Battery

Power Kits Compatibility

5kWh LFP Battery — EcoFlow Power Kits Battery Compatibility

2kWh LFP Battery — EcoFlow Power Kits Battery Compatibility

RIVER Series Compatibility

RIVER 3 Plus EB600 Smart Extra Battery — EcoFlow RIVER Series Battery Compatibility

RIVER 3 Plus EB300 Smart Extra Battery — EcoFlow RIVER Series Battery Compatibility

Access the Complete EcoFlow Battery Compatibility Chart (Interactive) or view as images below:

All Model Details:

DELTA Pro 3
Capacity
4.1kWh4,096Wh
Port
4+8
Max Battery
2x
- Scalable up to 36.9kWh across 3 power stations and 6 batteries using a Smart Home Panel.
Compatible Batteries:
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  EcoFlow
  Amazon
- DELTA Pro
  Smart Extra Battery
  Capacity
  3.6kWh3,600Wh
  Port
  4+8
  EcoFlow
  Amazon
DELTA Pro
Capacity
3.6kWh3,600Wh
Port
4+8
Max Battery
2x
- Scalable up to 21.6kWh across 2 power stations and 4 batteries using a Hub or Smart Home Panel.
Compatible Batteries:
- DELTA Pro
  Smart Extra Battery
  Capacity
  3.6kWh3,600Wh
  Port
  4+8
  EcoFlow
  Amazon
DELTA 3 Ultra Plus
Capacity
3.1kWh3,072Wh
Port
4+8
Max Battery
2x
- Requires Extra Battery Expansion Adapter to connect 2nd battery.
Compatible Batteries:
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  EcoFlow
  Amazon
- DELTA 3 Max Plus
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  4+8
  EcoFlow
  Amazon
DELTA 3 Max Plus
Capacity
2kWh2,048Wh
Port
4+8
Max Battery
2x
- Requires Extra Battery Expansion Adapter to connect 2nd battery.
Compatible Batteries:
- DELTA 3 Max Plus
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  4+8
  EcoFlow
  Amazon
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  EcoFlow
  Amazon
- DELTA 3 Series
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter.
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  Adapter
  YesRequired
  EcoFlow
  Requires Smart Generator Adapter.
DELTA 3 1500
Capacity
1.5kWh1,536Wh
Port
XT150
Max Battery
1x
- EcoFlow
- Amazon
Compatible Batteries:
- DELTA 3 Series
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  EcoFlow
  Amazon
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 2
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  EcoFlow
DELTA 3 Plus
Capacity
1kWh1,024Wh
Port
XT150
Max Battery
1x
- EcoFlow
- Amazon
Compatible Batteries:
- DELTA 3 Series
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  EcoFlow
  Amazon
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 3 Max Plus
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 2
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  EcoFlow
DELTA 3
Capacity
1kWh1,024Wh
Port
XT150
Max Battery
1x
- EcoFlow
- Amazon
Compatible Batteries:
- DELTA 3 Series
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  EcoFlow
  Amazon
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 3 Max Plus
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 2
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  EcoFlow
DELTA 2 Max
Capacity
2kWh2,048Wh
Port
XT150
Max Battery
2x
- EcoFlow
- Amazon
Compatible Batteries:
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  EcoFlow
- DELTA 3 Max Plus
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA Max
  Extra Battery
  Capacity
  2kWh2,016Wh
  Port
  XT150
DELTA 2
Capacity
1kWh1,024Wh
Port
XT150
Max Battery
1x
- EcoFlow
- Amazon
Compatible Batteries:
- DELTA 2
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  EcoFlow
- DELTA 3 Series
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  EcoFlow
  Amazon
- DELTA Max
  Extra Battery
  Capacity
  2kWh2,016Wh
  Port
  XT150
DELTA Max (2000)
Capacity
2kWh2,016Wh
Port
XT150
Max Battery
2x
- EcoFlow
Compatible Batteries:
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  EcoFlow
- DELTA Max
  Extra Battery
  Capacity
  2kWh2,016Wh
  Port
  XT150
DELTA Max (1600)
Capacity
1.6kWh1,612Wh
Port
XT150
Max Battery
2x
- EcoFlow
Compatible Batteries:
- DELTA Max
  Extra Battery
  Capacity
  2kWh2,016Wh
  Port
  XT150
DELTA Pro Ultra X
Capacity
12.3kWh12,288Wh
Port
5+8
Max Battery
10x
- EcoFlow
- Amazon
- Scalable up to 30 batteries (10 per inverter across 3 inverters) using a Smart Home Panel.
Compatible Batteries:
- DELTA Pro Ultra Series
  Smart Extra Battery
  Capacity
  6.1kWh6,144Wh
  Port
  5+8
  EcoFlow
  Amazon
DELTA Pro Ultra
Capacity
6.1kWh6,144Wh
Port
5+8
Max Battery
5x
- EcoFlow
- Amazon
- Scalable up to 15 batteries (5 per inverter across 3 inverters) using a Smart Home Panel.
Compatible Batteries:
- DELTA Pro Ultra Series
  Smart Extra Battery
  Capacity
  6.1kWh6,144Wh
  Port
  5+8
  EcoFlow
  Amazon
Power Kits 5kVA (Gen 2) 100A
Capacity
2-46.1kWh
Port
PowerKit
Max Battery
9x
- EcoFlow
- Requires 1-3 Power Dock accessories to connect more than 3 batteries.
Compatible Batteries:
- 5kWh LFP Battery
  Capacity
  5.1kWh5,120Wh
  Port
  PowerKit
  EcoFlow
- 2kWh LFP Battery
  Capacity
  2kWh2,048Wh
  Port
  PowerKit
  EcoFlow
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Power Dock accessory.
- DELTA Pro
  Smart Extra Battery
  Capacity
  3.6kWh3,600Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Power Dock accessory.
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  Adapter
  YesRequired
  EcoFlow
  Requires Power Dock accessory and Smart Generator Adapter.
- DELTA 2
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Adapter
  YesRequired
  Requires Power Dock accessory and Smart Generator Adapter.
Power Kits 5kVA (Gen 2) 70A
Capacity
2-46.1kWh
Port
PowerKit
Max Battery
9x
- EcoFlow
- Requires 1-3 Power Dock accessories to connect more than 3 batteries.
Compatible Batteries:
- 5kWh LFP Battery
  Capacity
  5.1kWh5,120Wh
  Port
  PowerKit
  EcoFlow
- 2kWh LFP Battery
  Capacity
  2kWh2,048Wh
  Port
  PowerKit
  EcoFlow
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Power Dock accessory.
- DELTA Pro
  Smart Extra Battery
  Capacity
  3.6kWh3,600Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Power Dock accessory.
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  Adapter
  YesRequired
  EcoFlow
  Requires Power Dock accessory and Smart Generator Adapter.
- DELTA 2
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Adapter
  YesRequired
  Requires Power Dock accessory and Smart Generator Adapter.
Power Kits 3.6kW (Gen 1)
Capacity
2-46.1kWh
Port
PowerKit
Max Battery
9x
- EcoFlow
- Requires 1-3 Power Dock accessories to connect more than 3 batteries.
Compatible Batteries:
- 5kWh LFP Battery
  Capacity
  5.1kWh5,120Wh
  Port
  PowerKit
  EcoFlow
- 2kWh LFP Battery
  Capacity
  2kWh2,048Wh
  Port
  PowerKit
  EcoFlow
- DELTA Pro 3
  Smart Extra Battery
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Power Dock accessory.
- DELTA Pro
  Smart Extra Battery
  Capacity
  3.6kWh3,600Wh
  Port
  4+8
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Power Dock accessory.
- DELTA 2 Max
  Smart Extra Battery
  Capacity
  2kWh2,048Wh
  Port
  XT150
  Adapter
  YesRequired
  EcoFlow
  Requires Power Dock accessory and Smart Generator Adapter.
- DELTA 2
  Smart Extra Battery
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Adapter
  YesRequired
  Requires Power Dock accessory and Smart Generator Adapter.
RIVER 3 Plus Wireless
Capacity
0.3kWh286Wh
Port
Pogo Pin
Max Battery
1x
- EcoFlow
Compatible Batteries:
- RIVER 3 Plus EB300
  Smart Extra Battery
  Capacity
  0.3kWh286Wh
  Port
  Pogo Pin
  EcoFlow
  Amazon
- RIVER 3 Plus EB600
  Smart Extra Battery
  Capacity
  0.6kWh572Wh
  Port
  Pogo Pin
  EcoFlow
  Amazon
RIVER 3 Plus
Capacity
0.3kWh286Wh
Port
Pogo Pin
Max Battery
1x
- EcoFlow
- Amazon
Compatible Batteries:
- RIVER 3 Plus EB300
  Smart Extra Battery
  Capacity
  0.3kWh286Wh
  Port
  Pogo Pin
  EcoFlow
  Amazon
- RIVER 3 Plus EB600
  Smart Extra Battery
  Capacity
  0.6kWh572Wh
  Port
  Pogo Pin
  EcoFlow
  Amazon
RIVER Pro
Capacity
0.7kWh720Wh
Port
D-Sub 7W2
Max Battery
1x
- EcoFlow
Compatible Batteries:
- RIVER Pro
  Extra Battery
  Capacity
  0.7kWh720Wh
  Port
  D-Sub 7W2
  EcoFlow

Compatible Power Stations by Battery

Already have an EcoFlow extra battery? Select your battery below to find every compatible EcoFlow power station, including required cables, adapters, and connector types:

Select model to view full power system compatibility details, port types, and adapters.

Check by power station model above

All Battery Details:

DELTA Pro 3
Smart Extra Battery
Capacity
4.1kWh4,096Wh
Port
4+8
- EcoFlow
- Amazon
Compatible Systems:
- DELTA Pro 3
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Max Battery
  2x
  EcoFlow
  Amazon
  Review
  Scalable up to 36.9kWh across 3 power stations and 6 batteries using a Smart Home Panel.
- DELTA 3 Ultra Plus
  Capacity
  3.1kWh3,072Wh
  Port
  4+8
  Max Battery
  2x
  EcoFlow
  Amazon
  Review
  Requires Extra Battery Expansion Adapter to connect 2nd battery.
- DELTA 3 Max Plus
  Capacity
  2kWh2,048Wh
  Port
  4+8
  Max Battery
  2x
  EcoFlow
  Amazon
  Review
  Requires Extra Battery Expansion Adapter to connect 2nd battery.
- DELTA 3 1500
  Capacity
  1.5kWh1,536Wh
  Port
  XT150
  Max Battery
  1x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 3 Plus
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 3
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- Power Kits 5kVA (Gen 2) 100A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory.
- Power Kits 5kVA (Gen 2) 70A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory.
- Power Kits 3.6kW (Gen 1)
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory.
DELTA Pro
Smart Extra Battery
Capacity
3.6kWh3,600Wh
Port
4+8
- EcoFlow
- Amazon
Compatible Systems:
- DELTA Pro 3
  Capacity
  4.1kWh4,096Wh
  Port
  4+8
  Max Battery
  2x
  EcoFlow
  Amazon
  Review
  Scalable up to 36.9kWh across 3 power stations and 6 batteries using a Smart Home Panel.
- DELTA Pro
  Capacity
  3.6kWh3,600Wh
  Port
  4+8
  Max Battery
  2x
  EcoFlow
  Amazon
  Review
  Scalable up to 21.6kWh across 2 power stations and 4 batteries using a Hub or Smart Home Panel.
- Power Kits 5kVA (Gen 2) 100A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory.
- Power Kits 5kVA (Gen 2) 70A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory.
- Power Kits 3.6kW (Gen 1)
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory.
DELTA 3 Max Plus
Smart Extra Battery
Capacity
2kWh2,048Wh
Port
4+8
- EcoFlow
- Amazon
Compatible Systems:
- DELTA 3 Ultra Plus
  Capacity
  3.1kWh3,072Wh
  Port
  4+8
  Max Battery
  2x
  EcoFlow
  Amazon
  Review
  Requires Extra Battery Expansion Adapter to connect 2nd battery.
- DELTA 3 Max Plus
  Capacity
  2kWh2,048Wh
  Port
  4+8
  Max Battery
  2x
  EcoFlow
  Amazon
  Review
  Requires Extra Battery Expansion Adapter to connect 2nd battery.
- DELTA 3 Plus
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 3
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
- DELTA 2 Max
  Capacity
  2kWh2,048Wh
  Port
  XT150
  Max Battery
  2x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Requires Smart Generator Adapter and Extra Battery Cable.
DELTA 3 Series
Smart Extra Battery
Capacity
1kWh1,024Wh
Port
XT150
- EcoFlow
- Amazon
Compatible Systems:
- DELTA 3 Max Plus
  Capacity
  2kWh2,048Wh
  Port
  4+8
  Max Battery
  2x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Review
  Requires Extra Battery Expansion Adapter to connect 2nd battery.
  Requires Smart Generator Adapter.
- DELTA 3 1500
  Capacity
  1.5kWh1,536Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 3 Plus
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 3
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 2
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
DELTA 2 Max
Smart Extra Battery
Capacity
2kWh2,048Wh
Port
XT150
- EcoFlow
Compatible Systems:
- DELTA 3 Max Plus
  Capacity
  2kWh2,048Wh
  Port
  4+8
  Max Battery
  2x
  Adapter
  YesRequired
  EcoFlow
  Amazon
  Review
  Requires Extra Battery Expansion Adapter to connect 2nd battery.
  Requires Smart Generator Adapter.
- DELTA 3 1500
  Capacity
  1.5kWh1,536Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 3 Plus
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 3
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 2 Max
  Capacity
  2kWh2,048Wh
  Port
  XT150
  Max Battery
  2x
  EcoFlow
  Amazon
- DELTA 2
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA Max (2000)
  Capacity
  2kWh2,016Wh
  Port
  XT150
  Max Battery
  2x
  EcoFlow
- Power Kits 5kVA (Gen 2) 100A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory and Smart Generator Adapter.
- Power Kits 5kVA (Gen 2) 70A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory and Smart Generator Adapter.
- Power Kits 3.6kW (Gen 1)
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory and Smart Generator Adapter.
DELTA 2
Smart Extra Battery
Capacity
1kWh1,024Wh
Port
XT150
Compatible Systems:
- DELTA 3 1500
  Capacity
  1.5kWh1,536Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 3 Plus
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 3
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA 2
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- Power Kits 5kVA (Gen 2) 100A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory and Smart Generator Adapter.
- Power Kits 5kVA (Gen 2) 70A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory and Smart Generator Adapter.
- Power Kits 3.6kW (Gen 1)
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  Adapter
  YesRequired
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
  Requires Power Dock accessory and Smart Generator Adapter.
DELTA Max
Extra Battery
Capacity
2kWh2,016Wh
Port
XT150
Compatible Systems:
- DELTA 2 Max
  Capacity
  2kWh2,048Wh
  Port
  XT150
  Max Battery
  2x
  EcoFlow
  Amazon
- DELTA 2
  Capacity
  1kWh1,024Wh
  Port
  XT150
  Max Battery
  1x
  EcoFlow
  Amazon
- DELTA Max (2000)
  Capacity
  2kWh2,016Wh
  Port
  XT150
  Max Battery
  2x
  EcoFlow
- DELTA Max (1600)
  Capacity
  1.6kWh1,612Wh
  Port
  XT150
  Max Battery
  2x
  EcoFlow
DELTA Pro Ultra Series
Smart Extra Battery
Capacity
6.1kWh6,144Wh
Port
5+8
- EcoFlow
- Amazon
Compatible Systems:
- DELTA Pro Ultra X
  Capacity
  12.3kWh12,288Wh
  Port
  5+8
  Max Battery
  10x
  EcoFlow
  Amazon
  Scalable up to 30 batteries (10 per inverter across 3 inverters) using a Smart Home Panel.
- DELTA Pro Ultra
  Capacity
  6.1kWh6,144Wh
  Port
  5+8
  Max Battery
  5x
  EcoFlow
  Amazon
  Scalable up to 15 batteries (5 per inverter across 3 inverters) using a Smart Home Panel.
5kWh LFP Battery
Capacity
5.1kWh5,120Wh
Port
PowerKit
- EcoFlow
Compatible Systems:
- Power Kits 5kVA (Gen 2) 100A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
- Power Kits 5kVA (Gen 2) 70A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
- Power Kits 3.6kW (Gen 1)
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
2kWh LFP Battery
Capacity
2kWh2,048Wh
Port
PowerKit
- EcoFlow
Compatible Systems:
- Power Kits 5kVA (Gen 2) 100A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
- Power Kits 5kVA (Gen 2) 70A
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
- Power Kits 3.6kW (Gen 1)
  Capacity
  2-46.1kWh
  Port
  PowerKit
  Max Battery
  9x
  EcoFlow
  Requires 1-3 Power Dock accessories to connect more than 3 batteries.
RIVER 3 Plus EB600
Smart Extra Battery
Capacity
0.6kWh572Wh
Port
Pogo Pin
- EcoFlow
- Amazon
Compatible Systems:
- RIVER 3 Plus Wireless
  Capacity
  0.3kWh286Wh
  Port
  Pogo Pin
  Max Battery
  1x
  EcoFlow
- RIVER 3 Plus
  Capacity
  0.3kWh286Wh
  Port
  Pogo Pin
  Max Battery
  1x
  EcoFlow
  Amazon
RIVER 3 Plus EB300
Smart Extra Battery
Capacity
0.3kWh286Wh
Port
Pogo Pin
- EcoFlow
- Amazon
Compatible Systems:
- RIVER 3 Plus Wireless
  Capacity
  0.3kWh286Wh
  Port
  Pogo Pin
  Max Battery
  1x
  EcoFlow
- RIVER 3 Plus
  Capacity
  0.3kWh286Wh
  Port
  Pogo Pin
  Max Battery
  1x
  EcoFlow
  Amazon
RIVER Pro
Extra Battery
Capacity
0.7kWh720Wh
Port
D-Sub 7W2
- EcoFlow
Compatible Systems:
- RIVER Pro
  Capacity
  0.7kWh720Wh
  Port
  D-Sub 7W2
  Max Battery
  1x
  EcoFlow

Connector Types & Cable Compatibility

Most EcoFlow systems rely on three primary extra battery connection types:

XT150: Many DELTA series models
4+8 (4P8): Select DELTA and DELTA Pro series models
DELTA Pro Ultra: All DELTA Pro Ultra series models

Other product lines use distinct connection methods, such as the Power Kit extra battery cables, the cableless Pogo Pin docking mount on select RIVER 3 models, or the legacy D-Sub port on the RIVER Pro.

Matching connector types doesn't always mean two units are compatible. Surprisingly, even models with different connectors can sometimes work together using an adapter. All required adapters are accounted for in the compatibility data.

Accessories

Some of these cables and adapters are currently sold out. I’ve reached out to my EcoFlow contacts to see when they’ll be back in stock.

Battery Adapters

Smart Generator Adapter (XT150 to 4+8)
For use with Extra Battery, Alternator Charger or Smart Generator cables
Price: $69
Extra Battery Expansion Adapter (DELTA 3 Max Plus & Ultra Plus)
Splitter providing two connections for batteries and/or an alternator charger
Price: $199
Power Dock (Power Kit)
Connect three batteries and/or two 48V DC appliances to 5kVA Power Hub or 3.6kW Power Hub
Price: $439

Battery Cables

Extra Battery Cable (XT150)
Connects XT150 expansion ports found on many DELTA systems
Price: TBD
Extra Battery Flat Link Cable (4+8)
For use with DELTA Pro 3, DELTA Pro, DELTA 3 Ultra Plus, & DELTA 3 Max Plus
Price: $89–129
DELTA Pro Extra Battery Cable (4+8)
Connects the DELTA Pro to the DELTA Pro Smart Extra Battery
Price: $79
Battery Connection Cable (DELTA Pro Ultra)
For inverter-battery and battery-battery connections.
Price: $99–129

Joining Power Stations

You cannot use a second EcoFlow power station as an expansion battery to increase total capacity. Some DELTA Pro Series models support a hub or Smart Home Panel to combine their output power across multiple units.

Alternator Charger Compatibility

EcoFlow alternator chargers can use either an extra battery port or a solar port. Plugging into a battery port occupies it, leaving one less port available for an extra battery.

Other Systems

EcoFlow also offers specialized ecosystem products with limited cross-compatibility: WAVE 2 Add-on Battery, WAVE 3 Add-on Battery, and BLADE Smart Extra Battery. These can integrate with select compatible DELTA units. Additionally, compatible EcoFlow Smart Generators can connect to supported DELTA extra battery ports directly or via adapters for automated start-stop controls and direct DC charging.

Use code MATANICH at EcoFlow for an extra 5% off! See details.

EcoFlow's product documentation and compatibility charts don't always provide every combination in one place. This guide consolidates official EcoFlow manuals, technical specifications, and manufacturer charts into a single reference.

To ensure accuracy, I have my compatibility tables reviewed directly by EcoFlow internal contacts and product managers to verify individual compatibility claims and configurations. Working with these direct manufacturer contacts rather than general customer-support representatives ensures that specific connector types and adapter requirements are properly verified.

Compatibility Status Legend

Compatible: Officially supported and connects directly without extra adapters.
Needs Add-on: Officially supported, but requires a specific cable, adapter, or accessory to connect.
May Work: Not officially supported by EcoFlow, but may function in real-world testing. An ability to connect does not guarantee safe electrical or firmware compatibility. Compatibility could break with firmware updates. Attempt at your own risk.
Not Compatible: Not officially supported by EcoFlow and expected not to work. An ability to connect does not guarantee safe electrical or firmware compatibility. Some combinations may function in real-world testing. Attempt at your own risk.

⚠ Note: Some compatibility features and adapter support may require updating your power station and battery to the latest firmware version via the EcoFlow app.

Real-World Feedback & Findings

Have real-world compatibility findings to share? I would love to hear your feedback, whether it's a setup that works without official support or an issue with an officially compatible model.

Sources

EcoFlow Battery Compatibility Overview ^(image) - eu.ecoflow.com
EcoFlow DELTA 3 Max Plus Smart Extra Battery - us.ecoflow.com
EcoFlow DELTA 3 Max Plus Smart Extra Battery manual - manuals.ecoflow.com
EcoFlow DELTA 3 Max Plus Compatibility ^(image) - us.ecoflow.com
EcoFlow DELTA 3 Ultra Plus Compatibility ^(image) - us.ecoflow.com
EcoFlow DELTA Pro Ultra Series Smart Extra Battery - us.ecoflow.com
Power Kit Hub Compatibility ^(image) - www.ecoflow.com
EcoFlow RIVER 3 Plus Smart Extra Battery - us.ecoflow.com

NOTE: An official EcoFlow graphic ^(example) widely shared across numerous sites and online communities incorrectly indicates that the DELTA Max Extra Battery is compatible with the DELTA 3 and DELTA 3 1500. When I brought this discrepancy to EcoFlow’s attention during my review process, they confirmed the graphic contains an error and are working to correct it.

Questions or feedback? Connect on Facebook, Instagram, or email. If you found this post helpful, please share it with others!

Tyson Matanich

Updated: August 18, 2026, Published: August 12, 2026


		DELTA Pro 3 is not compatible with DELTA 3 Max Plus Smart Extra Battery	DELTA Pro 3 is not compatible with DELTA 3 Series Smart Extra Battery	DELTA Pro 3 is not compatible with DELTA 2 Max Smart Extra Battery	DELTA Pro 3 is not compatible with DELTA 2 Smart Extra Battery	DELTA Pro 3 is not compatible with DELTA Max Extra Battery
DELTA Pro is not compatible with DELTA Pro 3 Smart Extra Battery		DELTA Pro is not compatible with DELTA 3 Max Plus Smart Extra Battery	DELTA Pro is not compatible with DELTA 3 Series Smart Extra Battery	DELTA Pro is not compatible with DELTA 2 Max Smart Extra Battery	DELTA Pro is not compatible with DELTA 2 Smart Extra Battery	DELTA Pro is not compatible with DELTA Max Extra Battery
	DELTA 3 Ultra Plus is not compatible with DELTA Pro Smart Extra Battery		DELTA 3 Ultra Plus is not compatible with DELTA 3 Series Smart Extra Battery	DELTA 3 Ultra Plus is not compatible with DELTA 2 Max Smart Extra Battery	DELTA 3 Ultra Plus is not compatible with DELTA 2 Smart Extra Battery	DELTA 3 Ultra Plus is not compatible with DELTA Max Extra Battery
	DELTA 3 Max Plus is not compatible with DELTA Pro Smart Extra Battery				DELTA 3 Max Plus is not compatible with DELTA 2 Smart Extra Battery	DELTA 3 Max Plus is not compatible with DELTA Max Extra Battery
	DELTA 3 1500 is not compatible with DELTA Pro Smart Extra Battery	DELTA 3 1500 is not compatible with DELTA 3 Max Plus Smart Extra Battery


DELTA 2 Max is not compatible with DELTA Pro 3 Smart Extra Battery			DELTA 2 Max is not compatible with DELTA 3 Series Smart Extra Battery		DELTA 2 Max is not compatible with DELTA 2 Smart Extra Battery
		DELTA 2 is not compatible with DELTA 3 Max Plus Smart Extra Battery
DELTA Max (2000) is not compatible with DELTA Pro 3 Smart Extra Battery	DELTA Max (2000) is not compatible with DELTA Pro Smart Extra Battery	DELTA Max (2000) is not compatible with DELTA 3 Max Plus Smart Extra Battery	DELTA Max (2000) is not compatible with DELTA 3 Series Smart Extra Battery		DELTA Max (2000) is not compatible with DELTA 2 Smart Extra Battery
DELTA Max (1600) is not compatible with DELTA Pro 3 Smart Extra Battery	DELTA Max (1600) is not compatible with DELTA Pro Smart Extra Battery	DELTA Max (1600) is not compatible with DELTA 3 Max Plus Smart Extra Battery	DELTA Max (1600) is not compatible with DELTA 3 Series Smart Extra Battery	DELTA Max (1600) is not compatible with DELTA 2 Max Smart Extra Battery	DELTA Max (1600) is not compatible with DELTA 2 Smart Extra Battery


		RIVER 3 Plus Wireless is not compatible with RIVER Pro Extra Battery
		RIVER 3 Plus is not compatible with RIVER Pro Extra Battery
RIVER Pro is not compatible with RIVER 3 Plus EB600 Smart Extra Battery	RIVER Pro is not compatible with RIVER 3 Plus EB300 Smart Extra Battery