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By connecting the Ecoflow Delta Max Extra Battery to the Delta Max, you can double or triple the capacity from 2016 Wh to 4032 Wh or even 6048 Wh. With the connection cable that comes standard with the extra battery, the extra battery can be connected to the Delta Max.
| Brand | Ecoflow |
| Battery capacity in Wh | 2016 Wh |
| Capacity | 40 Ah / 2016 Wh |
| Dimensions | 46,5 x 23,6 x 28,2 cm |
| Weight | 17.8 kg |
| Material | Aluminum and plastic |