BLUETTI B500K Expansion Battery for APEX 300 | 5,120Wh

Extend your BLUETTI APEX 300 system with 5,120Wh of additional battery capacity. The B500K is designed for longer home-backup, off-grid and caravan runtime where maximum stored energy matters more than portability.

Why choose the B500K?

• 5,120Wh extra capacity: An APEX 300 paired with one B500K provides 7,884.8Wh of combined nominal capacity.
• Long-life battery: LiFePO4 cells rated for 4,000+ life cycles.
• High-capacity expansion: A strong choice for longer outages, heavier daily energy use and larger off-grid systems.
• Flexible installation: Suitable for a fixed setup, with optional wall, rack and trolley solutions available separately.
• Part of the BLUETTI ecosystem: Designed to work with the APEX 300 and other compatible BLUETTI systems when the correct connection cable is used.

Key specifications

• Capacity: 5,120Wh
• Battery chemistry: LiFePO4
• Life cycles: 4,000+
• Weight: approximately 45kg
• Connection: CA90 short cable for APEX 300

What is included?

• 1 × BLUETTI B500K expansion battery
• 1 × CA90 short battery expansion cable
• 1 × user manual

Compatibility note: This listing is for the APEX 300 short-cable version. The B500K has no built-in AC outlets and requires a compatible BLUETTI power station or supported system component to supply usable output power.