BLUETTI B500K 5,120Wh Expansion Battery

The BLUETTI B500K Expansion Battery is a high-capacity 5,120Wh LiFePO₄ battery module designed to extend the runtime and storage capacity of compatible BLUETTI power stations. Featuring more than 4,000 battery cycles, third-generation wireless internal construction, active cooling, flexible wall or trolley installation and broad BLUETTI ecosystem compatibility, it provides dependable energy storage for home backup, caravanning, off-grid living, small businesses, emergencies and extended outdoor power applications.

Product Information

Brand: BLUETTI
Model: B500K
Product Type: Expansion Battery / Portable Energy Storage Battery
Battery Capacity: 5,120Wh / 5.12kWh
Battery Chemistry: LiFePO₄ / Lithium Iron Phosphate
Cycle Life: 4,000+ Cycles to 80% Original Capacity
Expected Service Life: Up to 10 Years
Battery Management: Integrated Battery Management System
Expansion Ports: 2
Maximum Expansion Port Rating: 58.4V DC, 90A
Maximum Charging Current: 65A
Maximum Discharging Current: 70A
Compatible Power Stations: BLUETTI Apex 300, AC200L, AC200MAX, AC300 and AC500
Maximum Ecosystem Expansion: Up to 100kWh in supported multi-unit configurations
Standalone Power Function: Requires compatible BLUETTI ecosystem accessories
Warranty: 4 Years
Compatibility Note: The required expansion cable depends on the connected BLUETTI power station and selected B500K product variant.

Key Features & Benefits

5,120Wh Expansion Capacity:
Adds 5.12kWh of battery storage to a compatible BLUETTI power system, helping extend runtime for household appliances, refrigeration, communication equipment, lighting, tools and essential electronics.

More Than 4,000 Battery Cycles:
Built with long-lasting LiFePO₄ battery technology designed to retain approximately 80% of its original capacity after more than 4,000 complete charging cycles.

Up to 10 Years of Reliable Energy Storage:
Designed to provide dependable backup and off-grid energy storage for up to a decade under suitable usage, charging and storage conditions.

Scalable Energy Storage:
Allows compatible BLUETTI systems to expand from essential appliance backup to whole-home, off-grid or small-business energy storage configurations.

Up to 100kWh Ecosystem Expansion:
Supports larger compatible BLUETTI configurations that can scale to as much as 100kWh for extended backup duration and higher energy requirements.

Broad BLUETTI Compatibility:
Works with compatible BLUETTI Apex 300, AC200L, AC200MAX, AC300 and AC500 power systems, helping users expand both existing and newer BLUETTI configurations.

Third-Generation Wireless Internal Design:
Uses an advanced internal structure with fewer conventional wiring connections, helping improve durability and resistance to knocks, shocks and vibration.

Active Cooling System:
An integrated cooling fan helps regulate internal temperatures and maintain stable battery performance during demanding charging and discharging conditions.

Fixed or Mobile Installation:
Can be secured to a suitable wall or rack using its mounting points or installed on the optional BLUETTI Foldable Trolley 2 for easier movement.

Smarter Power Ecosystem Integration:
Can be paired with compatible BLUETTI ecosystem products such as the Apex 300, SolarX 4K and Hub D1 for expanded renewable energy and DC power applications.

Optional Standalone DC Power:
When paired with compatible ecosystem components such as the BLUETTI Hub D1, the B500K can support up to 700W of DC power for suitable devices and applications.

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

Mechanical Specifications

Product Type: Expansion Battery Module
Dimensions: 520 × 327 × 308.5mm
Dimensions in Inches: 20.47 × 12.87 × 12.15in
Net Weight: 45kg / 99.21lb
Installation Type: Stackable, wall-mounted, rack-mounted or trolley-supported installation
Mounting Support: Integrated mounting points
Portable Setup: Compatible with the separately sold BLUETTI Foldable Trolley 2
Internal Construction: Third-Generation Wireless Internal Frame
Cooling System: Integrated Active Cooling Fan
Connection Type: Dual BLUETTI Expansion Battery Ports
Working Humidity: 5%–95% RH
Charging Temperature: 0°C to 40°C / 32°F to 104°F
Discharging Temperature: -20°C to 40°C / -4°F to 104°F
Storage Temperature – Up to One Month: -20°C to 40°C / -4°F to 104°F
Storage Temperature – Up to Six Months: -20°C to 25°C / -4°F to 77°F

Warranty Information

Warranty: 4 Years
Customer Support: Lifetime Customer Support
Battery Cycle Rating: 4,000+ Cycles to 80% Original Capacity
Product Registration: Product registration may be required to activate or claim the available warranty coverage.
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: Install the battery in a stable, dry and ventilated location away from excessive heat, moisture and direct exposure to severe weather.
Handling Requirement: Due to its 45kg weight, use appropriate lifting assistance and secure the battery properly during transport or installation.

Electrical Performance

Battery Specifications

Battery Capacity: 5,120Wh / 5.12kWh
Battery Chemistry: LiFePO₄ / Lithium Iron Phosphate
Cycle Life: 4,000+ Cycles to 80% Original Capacity
Expected Service Life: Up to 10 Years
Battery Management: Integrated Battery Management System
Maximum Charging Current: 65A
Maximum Discharging Current: 70A

Expansion Port Specifications

Number of Expansion Ports: 2
Maximum Expansion Port Voltage: 58.4V DC
Maximum Expansion Port Current: 90A
Primary Output Type: BLUETTI battery expansion connection
AC Output: Not available directly from the B500K
Built-In USB Output: Not available
Built-In Car Outlet: Not available
Standalone DC Output: Requires a compatible accessory such as the BLUETTI Hub D1

Charging Performance

Charging Management: Controlled through the connected BLUETTI power station or compatible charging accessory
AC Charging: Supported through compatible BLUETTI power stations
Solar Charging: Supported through the connected power station’s solar input system
Vehicle Charging: Supported when paired with compatible BLUETTI vehicle charging accessories
Generator Charging: Supported through compatible connected power stations
Maximum Charging Current: 65A
Direct Wall Charging: Requires a compatible BLUETTI power station or approved charging accessory

Actual charging time depends on:

• Connected BLUETTI power station
• Charging source and available input power
• Number of connected expansion batteries
• Battery state of charge
• Ambient and battery temperature
• System configuration and cable type

Compatibility

Compatible Products: BLUETTI Apex 300, AC200L, AC200MAX, AC300 and AC500
Apex 300 Maximum B500K Batteries: Up to 6
Apex 300 Maximum Capacity: Up to 33,484.8Wh with six B500K batteries
AC200L Maximum B500K Batteries: Up to 2
AC200L Maximum Capacity: Up to 12,288Wh with two B500K batteries
AC300 Maximum B500K Batteries: Up to 4
AC300 Maximum Capacity: Up to 20,480Wh with four B500K batteries
AC500 Maximum B500K Batteries: Up to 6
AC500 Maximum Capacity: Up to 30,720Wh with six B500K batteries
Dual AC500 Split-Phase Configuration: Supports up to 12 B500K batteries
Dual AC500 Maximum Battery Capacity: Up to 61,440Wh
Broader System Expansion: Up to 100kWh in supported BLUETTI multi-unit configurations
Power Bank Mode: Requires a compatible accessory such as the BLUETTI Hub D1
Cable Requirement: The supplied or required cable varies according to the connected power station.
Compatibility Limitation: The B500K does not include an integrated inverter and cannot provide direct AC power without a compatible BLUETTI power station.

Smart Energy Features

• Supports expandable BLUETTI energy storage
• Provides 5,120Wh of additional battery capacity
• Uses long-lasting LiFePO₄ battery technology
• Provides more than 4,000 battery cycles
• Designed for up to 10 years of energy storage use
• Supports up to 100kWh in compatible BLUETTI ecosystem configurations
• Supports Apex 300 expansion up to 33,484.8Wh
• Supports AC200L expansion up to 12,288Wh
• Supports AC300 expansion up to 20,480Wh
• Supports AC500 expansion up to 30,720Wh
• Supports dual AC500 configurations up to 61,440Wh
• Features two high-current expansion ports
• Supports up to 65A charging current
• Supports up to 70A discharging current
• Features third-generation wireless internal construction
• Includes an integrated active cooling fan
• Supports wall, rack or trolley installation
• Supports compatible BLUETTI home backup systems
• Supports compatible off-grid energy configurations
• Supports optional DC power through compatible ecosystem accessories
• Designed for long-term backup and frequent battery use

Applications

• Home backup power systems
• Whole-home energy storage configurations
• Power outage preparedness
• Off-grid homes and cabins
• RV and caravan energy storage
• Camping and outdoor adventures
• Small-business backup power
• Remote work locations
• Emergency communication backup
• Refrigerator and freezer backup
• Medical device backup with a compatible power station
• Lighting and household appliance backup
• Mobile business operations
• Outdoor events
• Solar energy storage
• Extended road trips
• Disaster preparedness
• Renewable energy self-consumption

Included Accessories

• BLUETTI B500K Expansion Battery × 1
• Compatible Battery Expansion Cable × 1
• User Manual × 1

The supplied expansion cable depends on the selected B500K variant. Apex 300 configurations may include a CA90 cable, while AC200L or AC300 configurations may include a P090A long cable. Additional adapters may be required for certain systems.

System Benefits When Paired with Compatible BLUETTI Power Stations

• Adds 5,120Wh of battery storage to a compatible BLUETTI 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 business requirements grow
• Supports Apex 300, AC200L, AC200MAX, AC300 and AC500 systems
• Provides more than 4,000 battery cycles for long-term energy storage
• Supports flexible wall, rack or trolley installation
• Provides active cooling for stable battery operation
• Supports partial-home, whole-home and small-business backup configurations
• Improves energy security during blackouts and emergencies
• Supports extended RV, caravan and off-grid travel
• Provides quiet and emission-free stored energy
• Supports compatible BLUETTI solar and DC power ecosystem components
• Helps maintain essential power for refrigeration, lighting, communication, tools and other critical devices
• Supports longer off-grid power use when paired with compatible BLUETTI power stations, portable solar panels and charging accessories.

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