The EcoFlow DELTA 3 Extra Battery is a 1,024 Wh add-on pack, 10 kg and 39.8 × 20 × 19.8 cm, that doubles the storage of a DELTA 3, DELTA 3 1500 or DELTA 3 Plus to 2,048 Wh. The same pack can also be connected to the older EcoFlow DELTA 2, so it stays useful even if the host station is upgraded later. Its LiFePO4 cells are rated for 4,000 cycles to 80% capacity, which roughly matches about 10 years of daily use, and the housing carries an IP65 rating for dust and water resistance.

• 1,024 Wh LiFePO4 add-on capacity for DELTA 3, DELTA 3 1500, DELTA 3 Plus and DELTA 2
• Immediately available after connection: charging, discharging and monitoring go through the host station
• 4,000 cycles to 80% capacity for a very long service life
• IP65 housing for dust and low-pressure water jet exposure
• Compact 10 kg body, easy to carry and to slot next to the host station
• Fully controlled from the EcoFlow app once linked to the host

Key specs

• Capacity: 1,024 Wh
• Cell chemistry: LiFePO4
• Cycles: 4,000 cycles to 80% capacity
• IP rating: IP65
• Weight: 10 kg
• Dimensions: 39.8 × 20 × 19.8 cm
• Warranty: 5 years

The DELTA 3 Extra Battery is a good match for home backup users who need to cover an entire working day of critical loads, van and camper builds that need to reach a full night on climate control, and event or workshop set-ups that would otherwise run out of stored energy well before the sun comes back. Since the same pack works across DELTA 3 and DELTA 2 hosts, it can be moved between installations without becoming obsolete.