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Accessories › Bluetti Apex 300
Bluetti Apex 300 accessories
The add-on batteries that Bluetti itself sells for the Apex 300. We list an accessory only where the maker states the pairing, and show that statement, its source and the date we last confirmed it.
Add-on batteries
| Battery | Price | Capacity with one added | Fridge runtime with it (est.) | Why it's listed | |
|---|---|---|---|---|---|
| Bluetti B300K Expansion Battery (for Apex 300) 2,764.8Wh | $1,199 2026-10-11 | 5,530 Wh from 2,765 | 3.7 days from 44.8 hrs | Bluetti's listing says so: “B300K for Apex 300” (source, confirmed 2026-10-11) |
Capacities are Bluetti's published figures. Fridge runtime is our estimate (full-size fridge, 85% inverter efficiency), not a test. Bluetti says the Apex 300 can be expanded to 58,000Wh in total.
Back to the Bluetti Apex 300, or size a whole setup with solar and add-on batteries in the home backup planner.