The BLUETTI B300K Expansion Battery delivers 2,764.8Wh of automotive-grade LiFePO₄ power, purpose-built to extend your Apex 300 system from daily convenience to whole-home resilience. With over 6,000 deep cycles and a 17-year estimated lifespan, this is energy storage you can count on for the long haul.
Pair it with the Apex 300 to scale your system all the way to 58kWh, and pair multiple units with the SolarX 4K for ultra-fast solar charging. The B300K also includes a standalone USB-A port for direct device charging anytime.
Key Features
2,764.8Wh Capacity — 6,000+ Cycles: Automotive-grade LiFePO₄ cells built for daily use and long-term reliability.
Scale to 58kWh: Expand your Apex 300 system for whole-home or multi-zone backup.
Seamless Compatibility: Designed specifically for the Apex 300 power station.
Fast Solar Charging: Pairs with the SolarX 4K for a full charge in as little as 1.9 hours.
Standalone USB-A Port: Charge devices directly without needing a connected power station.
3+1 Year Warranty: Long-term coverage for your peace of mind.
Whether it's your first project or your fifth, our USA-based team is here for you. Lifetime support means you're never on your own.

Capacity
2,764.8Wh
Battery Type
Automotive-Grade LiFePO₄
Cycle Life
6,000+ Cycles
Estimated Lifespan
17 Years
Compatible Systems
Apex 300
Max Scalability
Up to 58kWh with Apex 300
USB Output
USB-A (standalone charging)
Weight
29.5 kg (65 lbs)
Warranty
3+1 Years
Brand
BLUETTI