BLUETTI B300K 2,764.8Wh Expansion Battery

The BLUETTI B300K Expansion Battery is a high-capacity 2,764.8Wh LiFePO₄ battery module designed to expand the energy storage capacity of compatible BLUETTI power stations. Featuring automotive-grade lithium iron phosphate cells, more than 6,000 battery cycles, intelligent AI-powered battery management and a built-in USB-A output, it provides dependable energy storage for home backup, off-grid living, RV travel, emergencies and extended outdoor power applications.

Product Information

Brand: BLUETTI
Model: B300K
Product Type: Expansion Battery / Portable Energy Storage Battery
Battery Capacity: 2,764.8Wh
Rated Battery Voltage: 51.2V
Rated Battery Capacity: 54Ah
Battery Chemistry: LiFePO₄ / Lithium Iron Phosphate
Battery Cell Grade: Automotive-Grade
Cycle Life: 6,000+ Cycles to 80% Original Capacity
Battery Management System: Intelligent AI-BMS
Standalone Power Function: Supported
USB-A Output: 12W Maximum
Compatible Power Stations: BLUETTI Apex 300, AC200L, AC200MAX, AC300 and AC500
Maximum System Expansion: Up to 58kWh with a compatible Apex 300 configuration
Warranty: 3 Years + 1-Year Extended Warranty with Registration
Compatibility Note: Some compatible power stations may require a separately sold connection cable or adapter.

Key Features & Benefits

2,764.8Wh Expansion Capacity:
Adds 2,764.8Wh of battery storage to compatible BLUETTI power stations, helping extend backup runtime for household appliances, outdoor equipment, communication devices and essential electronics.

Automotive-Grade LiFePO₄ Battery:
Uses durable lithium iron phosphate battery cells designed to provide improved thermal stability, safety and long-term reliability.

More Than 6,000 Battery Cycles:
Designed to retain approximately 80% of its original capacity after more than 6,000 charge cycles, making it suitable for frequent home backup and off-grid energy use.

Intelligent AI Battery Management:
The integrated AI-BMS continuously manages battery operation and helps protect against abnormal voltage, current, temperature and other potentially unsafe operating conditions.

Expandable Energy Storage:
Allows compatible BLUETTI systems to be expanded as energy requirements increase, supporting applications ranging from portable backup power to larger home and off-grid energy configurations.

Up to 58kWh with Apex 300:
When used within a supported Apex 300 configuration, multiple B300K batteries can expand total energy storage to as much as 58kWh for longer backup duration and higher energy demands.

Fast Battery Charging:
When paired with a compatible BLUETTI AC300 or AC500 system, the B300K can recharge from 0% to approximately 80% in as little as 45 minutes under suitable operating conditions.

Standalone USB-A Power:
The built-in USB-A output allows the B300K to function as a standalone power source for compatible smartphones, tablets, portable fans, lights and other USB-powered devices.

Durable Aluminium Housing:
Features a strong aluminium enclosure designed to protect the internal battery components during home, travel and off-grid use.

Advanced Thermal Management:
Integrated cooling components help manage operating temperature and support stable battery performance during charging and discharging.

Flexible Power Station Compatibility:
Works with multiple compatible BLUETTI power stations, allowing users to upgrade or expand existing BLUETTI energy systems.

Reliable Emergency Backup:
Provides additional stored energy during blackouts, extreme weather, remote travel and other situations where grid electricity may be limited or unavailable.

Mechanical Specifications

Product Type: Expansion Battery Module
Dimensions: 52.5 × 32.7 × 20.9cm
Dimensions in Inches: 20.67 × 12.87 × 8.23in
Net Weight: 29.5kg / 65.04lb
Housing Material: Durable Aluminium Casing
Installation Type: Stackable battery connection with compatible BLUETTI power stations
Portability: Transportable expansion battery design
Cooling System: Integrated cooling components
Connection Type: BLUETTI expansion battery connection
Recommended Use: Indoor backup systems, RV installations, protected outdoor setups and off-grid energy systems

Warranty Information

Standard Product Warranty: 3 Years
Extended Warranty: Additional 1 Year Available with Product Registration
Total Available Warranty: Up to 4 Years
Customer Support: Lifetime Customer Support
Battery Cycle Rating: More Than 6,000 Cycles to 80% Capacity
Compatibility Requirement: Use only with compatible BLUETTI power stations, approved cables and supported system configurations.
Storage Recommendation: Recharge the battery periodically during long-term storage and avoid leaving it fully discharged for extended periods.
Installation Requirement: Keep the battery in a dry, ventilated and stable location away from excessive heat, moisture and direct exposure to severe weather.

Electrical Performance

Battery Specifications

Battery Capacity: 2,764.8Wh
Rated Voltage: 51.2V
Rated Capacity: 54Ah
Battery Chemistry: LiFePO₄ / Lithium Iron Phosphate
Battery Cell Type: Automotive-Grade Square LiFePO₄ Cells
Cycle Life: 6,000+ Cycles to 80% Original Capacity
Battery Management: Intelligent AI-BMS
Standalone Operation: Supported through USB-A output

Output Specifications

USB-A Output: 5V / 2.4A
Maximum USB-A Power: 12W
Supported Devices: Smartphones, tablets, portable fans, lights and other compatible USB-powered devices
Primary Battery Output: Expansion battery connection for compatible BLUETTI power stations
AC Output: Not available directly from the B300K
USB-C Output: Not available
DC Car Outlet: Not available

Charging Performance

Fast-Charging Capability: Supported when connected to compatible BLUETTI systems
0–80% Charging Time: Approximately 45 Minutes with AC300 or AC500 under suitable conditions
Charging Management: Controlled through the connected BLUETTI power station and integrated BMS
Charging Methods: Dependent on the connected power station’s supported AC, solar, generator or vehicle charging options
Standalone Direct Charging: Requires a compatible BLUETTI charging system or supported accessory configuration

Compatibility

Compatible Products: BLUETTI Apex 300, AC200L, AC200MAX, AC300 and AC500
Primary Connection Cable: BLUETTI CA90 Battery Connection Cable
AC500 Connection Requirement: A P090D-to-P150D cable is required and sold separately.
Standalone USB Operation: Supported through the built-in USB-A output
System Expansion: Multiple batteries may be supported depending on the connected power station and system configuration.
Apex 300 Expansion: Supports compatible configurations providing up to approximately 58kWh of total energy storage.
Compatibility Limitation: The B300K cannot function as a complete AC power station by itself because it does not include an integrated AC inverter.
Cable Requirement: Always use BLUETTI-approved battery cables and adapters designed for the connected power station.

Smart Energy Features

• Supports expandable BLUETTI battery storage
• Provides 2,764.8Wh of additional battery capacity
• Uses automotive-grade LiFePO₄ battery cells
• Provides more than 6,000 battery cycles
• Uses intelligent AI-powered battery management
• Supports fast charging with compatible BLUETTI systems
• Supports approximately 0–80% charging in 45 minutes with AC300 or AC500
• Supports standalone USB-A device charging
• Provides up to 12W USB-A output
• Supports compatible home backup power systems
• Supports compatible off-grid energy configurations
• Supports Apex 300 system expansion up to approximately 58kWh
• Features durable aluminium battery housing
• Includes integrated thermal management components
• Supports modular system expansion as energy needs grow
• Designed for long-term backup and frequent battery use

Applications

• Home backup power systems
• Power outage preparedness
• Off-grid homes and cabins
• RV and caravan energy storage
• Camping and outdoor adventures
• Remote work locations
• Emergency communication backup
• Refrigerator and freezer backup
• Medical device backup with a compatible power station
• Lighting and small appliance backup
• Mobile business operations
• Outdoor events
• Solar energy storage
• Extended road trips
• Disaster preparedness
• Portable USB device charging

Included Accessories

• BLUETTI B300K Expansion Battery × 1
• BLUETTI CA90 Battery Connection Cable × 1
• User Manual × 1

Additional cables or adapters may be required for certain compatible BLUETTI power stations. The P090D-to-P150D cable required for AC500 connection is sold separately.

System Benefits When Paired with Compatible BLUETTI Power Stations

• Adds 2,764.8Wh of usable battery storage to a compatible system
• Extends backup runtime for essential household appliances and electronics
• Helps reduce reliance on grid electricity during outages
• Supports storage of renewable energy generated by compatible solar panels
• Allows battery capacity to expand as household or off-grid energy requirements grow
• Supports compatible BLUETTI systems including Apex 300, AC200L, AC200MAX, AC300 and AC500
• Provides more than 6,000 battery cycles for long-term energy storage
• Supports fast recharging when paired with suitable BLUETTI power stations
• Provides standalone USB-A charging for small electronic devices
• Improves energy security during outages and emergencies
• Supports extended RV, caravan and remote travel
• Provides quiet and emission-free stored energy
• Allows selected Apex 300 configurations to scale up to approximately 58kWh
• Helps maintain essential power for refrigeration, lighting, communication and other critical devices
• Supports longer off-grid power use when paired with compatible BLUETTI power stations, solar panels and charging accessories.

Contact PVtoEV for compatibility guidance and complete BLUETTI power station, expansion battery and solar charging recommendations.