EcoFlow Smart Extra Battery 2kWh – DELTA Series Expansion, LiFePO4, Stackable

EcoFlow Smart Extra Battery 2kWh – LiFePO4 Expansion for DELTA Series, Stackable

The EcoFlow Smart Extra Battery 2kWh is the most versatile expansion battery ever designed — universally compatible with EcoFlow DELTA Pro, DELTA Max, and DELTA 2 Max power stations. A single extra battery immediately doubles your backup capacity, and up to three can be stacked for an extraordinary 8,192Wh of total combined LiFePO4 energy storage.

About This Item

• 2,048Wh LiFePO4 Expansion Capacity: Adds 2,048Wh of LiFePO4 battery capacity to your existing EcoFlow DELTA power station via a single DC cable connection. Immediately doubles your backup runtime for all connected appliances.
• Universal DELTA Compatibility: Connects seamlessly to EcoFlow DELTA Pro (expanding to 7,200Wh), DELTA Max (expanding to 4,064Wh), and DELTA 2 Max (expanding to 4,096Wh) via the standard EcoFlow expansion port.
• Stackable – Up to 3 Units (6,144Wh Added): Chain up to three Smart Extra Batteries together for a total expansion of 6,144Wh. Combined with a DELTA Pro base unit, achieve the maximum 10,240Wh whole-home backup configuration.
• Independent Battery Health Monitoring: The EcoFlow app monitors each expansion battery independently, displaying individual cell voltage, state of health, charge cycles, and temperature. Proactively identify cells that need attention before they cause issues.
• Simultaneous Charge + Discharge: Charges from the base unit’s AC or solar input while simultaneously discharging to connected appliances. No interruption in output when transitioning between charging states.
• 3,000+ Cycle LiFePO4 Lifespan: LiFePO4 chemistry provides 3,000+ charge cycles with minimal capacity degradation — matching the lifespan of your DELTA base unit for a complete system longevity match.
• Passive Cooling Design: Natural convection cooling eliminates the need for fans, resulting in completely silent operation. No noise during overnight backup power delivery in bedrooms or home offices.

Product Information

Customer Reviews Highlights

★★★★½ 4.6/5 from 2,800+ verified buyers — EcoFlow DELTA Pro owners consistently describe this expansion battery as the most impactful upgrade for whole-home backup capability. The universal compatibility across multiple DELTA models is praised as protecting the investment even when upgrading base units. The completely silent passive cooling is noted as ideal for bedroom and office backup scenarios.