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The EcoFlow DELTA 3 Series Smart Extra Battery is an expansion battery with 1024 Wh LiFePO4 cells. It is compatible with the EcoFlow DELTA 3, DELTA 3 Plus, DELTA 3 1500 and DELTA 2. It can be stacked with the EcoFlow DELTA 3 series (DELTA 3 and DELTA 3 Plus) during use. The cell chemistry is LFP (LiFePO₄) and capacity stays above 80% after 4000 cycles. The warranty for this model is 5 years.
The lowest list price among the sheets in the Expansion batteries category (room-sized tier): €599, as published by the manufacturer.
How we assign awards →official manufacturer list price — on nominal capacity
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 39.8 × 20.2 × 19.8 cm (15.7 × 8.0 × 7.8 in) | manufacturer website |
| Weight | 9.6 kg (21.2 lb) | manufacturer website |
| Compatible models | EcoFlow DELTA 3, DELTA 3 Plus, DELTA 3 1500, DELTA 2 | Declared by the brand |
| Nominal capacity | 1.024 kWh | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Rated cycles | 4000 cicli | Declared by the brand |
| Capacity at end of cycle life | 80 % | Declared by the brand |
| Warranty | 5 anni | Declared by the brand |
| Official list price | 599 € | Declared by the brand |
| Usable capacity | — | Not declared |
| Depth of discharge | — | Not declared |
| Cell supplier | — | Not declared |
| Maximum expanded capacity | — | Not declared |
| Continuous output | — | Not declared |
| Peak output | — | Not declared |
| Peak duration | — | Not declared |
| AC outlets | — | Not declared |
| Fastest USB-C | — | Not declared |
| USB-A ports | — | Not declared |
| USB-C ports | — | Not declared |
| 12 V outputs | — | Not declared |
| 24 V outputs | — | Not declared |
| Maximum charge power | — | Not declared |
| 0–80% charge time | — | Not declared |
| Maximum solar input | — | Not declared |
| Backup power | — | Not declared |
| Switchover time | — | Not declared |
| Guaranteed throughput | — | Not declared |
| Guaranteed remaining capacity | — | Not declared |
| Round-trip efficiency | — | Not declared |
| Standby consumption | — | Not declared |
| Ingress protection | — | Not declared |
| Mounting | — | Not declared |
| Minimum temperature | — | Not declared |
| Maximum temperature | — | Not declared |
| Cell heating | — | Not declared |
| Noise level | — | Not declared |
| Wheels and handle | — | Not declared |
| Works without internet | — | Not declared |
| Local control | — | Not declared |
| Open protocols | — | Not declared |
| Home Assistant integration | — | Not declared |
| Where the data is hosted | — | Not declared |
| Remote updates | — | Not declared |
| App required for setup | — | Not declared |
| Declared standards | — | Not declared |
The rest of the data comes from 2 pages on the manufacturer's site, cited row by row in the table above.
A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.
These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.
