LiFePO4 batteries
BLUETTIExtra Battery B300K 2765Wh
Extra 2764.8Wh battery for BLUETTI's Apex 300, with 6000+ cycle life.
Capacity2765 Wh
Cycles6000 cycles
Compatible withBLUETTI Apex 300
Weight29.50 kg
Doubles the DELTA Pro's capacity for anyone who already knows they need it.EcoFlow · LiFePO4 batteries
EcoFlow Extra Battery DELTA Pro 3600Wh
Extra 3600Wh battery for the DELTA Pro — doubles its capacity. With 2 extra batteries it reaches 10.8 kWh.
—/ 10
PowerLight score
Our own read for home backup during a power outage, comparable across units in the catalog. Not Amazon buyers' rating. How we score →
- Wh
- 3600
- W continuous
- —
- kg
- —
ASIN verified against the listing on September 21, 2026We don't sell or ship anythingSpec sheet reviewed on October 30, 2026
Editorial verdict
Doubles the DELTA Pro's capacity for anyone who already knows they need it.
Best use case
Anyone who already has a DELTA Pro and confirmed they need double (or triple) the capacity to back up the whole house.
Adds another 3600 Wh to a DELTA Pro — the same capacity as the original station. With two of these batteries, a DELTA Pro reaches 10.8 kWh total, close to backing up an entire house for several days.
Only makes sense for someone who has already confirmed they need that extra capacity.
Pros
- Doubles the DELTA Pro's capacity with the same battery technology
- Up to 2 can be combined to reach 10.8 kWh
Ideal for: Anyone who already has a DELTA Pro and confirmed they need double (or triple) the capacity to back up the whole house.
Mandatory check with your shipping agency. PowerLight doesn't recommend shipping methods or determine whether a product can be accepted or shipped. Before buying, ask your shipping agency to confirm in writing that they accept the exact model, along with requirements, cost, and timeline.
Spec sheet
- Capacity
- 3600 Wh
- Weight
- —
- Cycle life
- —
- Warranty
- —
- Capacity
- 3600 Wh additional — same capacity as the DELTA Pro station
- Compatible with
- DELTA Pro. With 2 extra batteries it reaches 10.8 kWh total
- Warranty note
- EcoFlow doesn't have official support in every country: the warranty is handled through the country of purchase.
To understand this better
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Extra 4096Wh battery for the DELTA Pro 3 — same capacity as the station, with the same 5-year warranty.
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Cycles4000 cycles
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Weight32.70 kg
LiFePO4 batteries
EcoFlowExtra Battery DELTA 2 Max 2048Wh
Extra 2048Wh battery for the DELTA 2 Max — you can add up to 2 to reach 6144Wh total.
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Cycles3000 cycles
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Weight19.00 kg
EcoFlow Extra Battery DELTA Pro 3600Wh