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The EcoFlow DELTA Pro 3 Smart Extra Battery is a battery dedicated to a single device: it connects to the DELTA Pro 3 via the proprietary connector and increases its reserve. The power station accepts up to two batteries of this type together.
It charges together with the DELTA Pro 3, from the outlet or from an EcoFlow Dual Fuel generator via a dedicated adapter. It shouldn't be stacked on top of the unit, and if the two stay one on top of the other, they should rest with the long side against the wall to prevent falls.
It's for anyone who already has a DELTA Pro 3 and wants more reserve energy without buying a second power station. It's not for anyone looking for standalone storage: the only compatible model stated is the DELTA Pro 3.
official manufacturer list price — on nominal capacity
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 21.6 × 29.5 × 69.2 cm (8.5 × 11.6 × 27.2 in) | manufacturer website |
| Weight | 33.0 kg (72.8 lb) | manufacturer website |
| Compatible models | EcoFlow DELTA Pro 3 | Declared by the brand |
| Nominal capacity | 4.096 kWh | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Maximum expanded capacity | 12 kWh | 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 |
| Ingress protection | IP20 | Declared by the brand |
| Official list price | 2499 € | Declared by the brand |
| Usable capacity | — | Not declared |
| Depth of discharge | — | Not declared |
| Cell supplier | — | 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 |
| 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.
