EcoFlow DELTA 3 Max Plus Extra Battery | 2048Wh
Overview
The EcoFlow DELTA 3 Max Plus Smart Extra Battery adds 2048Wh of LFP storage to your EcoFlow DELTA 3 Max Plus, doubling total system capacity from 2048Wh to 4096Wh. Plug it into the power station's Extra Battery Port using the included cable, and the system automatically detects and manages the second battery. No setup, no configuration, no separate charger.
Built for home backup, freedom camping, motorhome power, and off-grid living, the extra battery gives you serious runtime when mains power isn't an option. Run a 65L fridge for over a week, keep essential appliances going through multi-day outages, or stay off-grid for longer without needing to recharge mid-trip. Add a second extra battery via the EcoFlow Smart Extra Battery Expansion Adapter to reach up to 10kWh of total system capacity on the DELTA 3 Max Plus.
Key Features:
- Capacity: 2048Wh (51.2V, 40Ah)
- Cell Chemistry: LFP (LiFePO₄)
- Cycle Life: 4,000 cycles to 80% capacity
- Weight: Approx. 16kg
- Dimensions (W x D x H): Approx. 494 x 239 x 196mm
- Extra Battery Port Output: 43.2V-57.6V, 100A max
- Extra Battery Port Input: 43.2V-57.6V, 48A max
- Protections: Overvoltage, overload, overtemperature, short circuit, low temperature, low voltage, overcurrent
- Optimal Operating Temperature: 20°C to 30°C
- Charge Temperature: 0°C to 45°C
- Discharge Temperature: -10°C to 45°C
- Storage Temperature: -10°C to 45°C
- App Monitoring: Via the host power station and EcoFlow app
What's in the Box?
- 1 x EcoFlow DELTA 3 Max Plus Smart Extra Battery
- 1 x Extra Battery Cable
- 1 x User Manual / Warranty Card
- Warranty: 5-year warranty
Note: Host power station sold separately. The extra battery only operates when connected to a compatible EcoFlow power station and is not a standalone unit.
Double Your DELTA 3 Max Plus Capacity
The DELTA 3 Max Plus has a standalone capacity of 2048Wh. Add this extra battery and total system capacity jumps to 4096Wh - enough to power a 250Wh-per-day camping fridge for over 16 days, or keep a router, modem, lights, laptop, and a few small appliances running through an extended power outage. The maximum AC output stays at 3000W, but your runtime doubles.
Plug-and-Play Setup
No setup, no configuration. Connect the extra battery to the DELTA 3 Max Plus Extra Battery Port using the included cable, turn it on, and the power station detects and manages it automatically. Charging and discharging happen through the host power station, so you only need one AC charger, one solar input, and one app to manage the entire system. The battery icon appears on the power station's screen once it's connected successfully.
LFP Chemistry for Long-Term Reliability
Lithium iron phosphate (LFP / LiFePO₄) cells offer a longer lifespan, better thermal stability, and improved safety compared to standard lithium-ion cells. The battery includes seven layers of protection covering overvoltage, overload, over temperature, short circuit, low temperature, low voltage, and overcurrent conditions. Built for daily use in NZ conditions, from baches to motorhomes to job sites.
Home Backup and Off-Grid Runtime
For NZ households facing winter outages, the extra battery gives you peace of mind. Paired with the DELTA 3 Max Plus and connected to essential loads, a 4096Wh system can run a fridge, internet router/modem, lights, and device charging through a multi-day outage. For motorhome and freedom camping use, the doubled capacity means you can stay off-grid for several days without needing mains power or solar top-up, depending on your daily load.
Expand Further with the Expansion Adapter
The DELTA 3 Max Plus has one Extra Battery Port on the back, which connects one extra battery directly. To run two extra batteries at once and reach the full 10kWh maximum capacity, use the EcoFlow Smart Extra Battery Expansion Adapter. The adapter splits the single port into two outputs, letting you stack a second extra battery onto the same setup.
Pairs Well With
This extra battery is designed to pair with the EcoFlow DELTA 3 Max Plus or EcoFlow DELTA 3 Ultra Plus. To run two extra batteries at the same time, add the EcoFlow Smart Extra Battery Expansion Adapter.
Frequently Asked Questions
Which power station is this extra battery compatible with?
The DELTA 3 Max Plus Smart Extra Battery is compatible with the EcoFlow DELTA 3 Max Plus and EcoFlow DELTA 3 Ultra Plus. It is not compatible with the DELTA 2, DELTA Pro, DELTA Pro 3, or RIVER series power stations.
Can I use this battery on its own without a power station?
No. The DELTA 3 Max Plus Smart Extra Battery is an expansion module only and requires a compatible EcoFlow power station to function. It has no AC outlets, USB ports, or independent solar input.
How do I charge the extra battery?
The extra battery charges automatically through the host power station. Connect it to your DELTA 3 Max Plus or DELTA 3 Ultra Plus using the included cable, then charge the power station via AC mains, solar panels, car charger, or alternator charger as you normally would. Both batteries charge together.
Can I connect two extra batteries to the same power station?
Yes, but you'll need the EcoFlow Smart Extra Battery Expansion Adapter. The DELTA 3 Max Plus and DELTA 3 Ultra Plus each have one Extra Battery Port, so the adapter is required to connect a second extra battery and reach the full expandable capacity (up to 10kWh on DELTA 3 Max Plus, up to 11kWh on DELTA 3 Ultra Plus).
What warranty does the DELTA 3 Max Plus Smart Extra Battery have in NZ?
The DELTA 3 Max Plus Smart Extra Battery includes a 5-year warranty in New Zealand.