BLUETTI B500K Expansion Battery — 5,120Wh LiFePO₄
The BLUETTI B500K expansion battery adds a substantial 5,120Wh of LiFePO₄ battery capacity to compatible BLUETTI power systems. It is designed for customers who need longer backup runtime, a larger home energy reserve, or a modular battery platform that can grow as power requirements increase.
With 4,000+ cycles to 80% original capacity, broad compatibility across multiple BLUETTI platforms and support for large-scale system expansion, the B500K is positioned as a high-capacity battery module for home backup, off-grid systems, RV installations and other applications where dependable stored energy is important.
Extend backup runtime with 5,120Wh
Each BLUETTI B500K expansion battery provides 5.12kWh of additional battery capacity. That makes it well suited to systems where runtime matters more than portability, including household backup, workshop power, longer off-grid stays and larger mobile power setups.
Instead of replacing an existing compatible power station when more storage is required, the B500K allows the battery side of the system to be expanded. This modular approach helps users increase stored energy while retaining the power electronics and charging capability of their compatible BLUETTI system.
Scalable energy storage for larger systems
BLUETTI states that supported B500K configurations can scale to as much as 100kWh of energy storage. The exact supported battery count and total capacity depend on the connected power station and system architecture, so the final configuration should always be checked against the relevant BLUETTI installation requirements.
For customers planning partial-home backup today but wanting room to expand later, this scalability is one of the major advantages of the B500K platform. The BLUETTI B500K expansion battery can form part of a staged energy-storage strategy rather than requiring the entire system to be sized for the maximum future requirement on day one.
Compatible across the BLUETTI ecosystem
Current BLUETTI Australia technical information lists compatibility with Apex 300, AC200L, AC200MAX, AC300 and AC500, and also lists B300K as a compatible expansion-battery platform. This gives the B500K a broad role across both newer and established BLUETTI systems.
This product configuration includes a P090A Long Battery Expansion Cable and is presented by BLUETTI for AC300/AC200L use. Cable and connection requirements can differ between power stations, so customers should confirm the correct accessories for the exact system being assembled rather than assuming one cable suits every possible configuration.
Reliable LiFePO₄ battery technology
The B500K uses LiFePO₄ battery chemistry and BLUETTI specifies 4,000+ cycles to 80% of original capacity. LiFePO₄ is widely used in modern energy-storage systems because it offers strong cycle life and stable operating characteristics for applications that may be charged and discharged regularly.
BLUETTI also highlights a third-generation wireless internal design and active cooling as part of the B500K’s durability and thermal-management approach. For a battery intended to remain in service as part of a larger backup system, these design features are aimed at supporting dependable long-term operation.
Fixed or movable installation
At approximately 45kg, the B500K is better suited to planned installation than frequent hand carrying. The enclosure measures approximately 52.0 × 32.7 × 30.85cm, so the intended location should provide adequate space and a suitable approach for positioning the battery.
BLUETTI provides mounting points that allow the B500K to be secured in a home or RV installation. It can also be paired with the separately sold Foldable Trolley 2 where mobility is required. This gives the BLUETTI B500K expansion battery flexibility for both stationary and movable system layouts.
BLUETTI B500K key specifications
| Product | BLUETTI B500K Expansion Battery |
|---|---|
| Capacity | 5,120Wh |
| Battery chemistry | LiFePO₄ (Lithium Iron Phosphate) |
| Life cycles | 4,000+ cycles to 80% original capacity |
| Compatibility | AC200L, AC200MAX, AC300, AC500, Apex 300, B300K |
| Weight | 45kg |
| Dimensions | 52.0 × 32.7 × 30.85cm |
| Charging temperature | 0°C to 40°C |
| Discharging temperature | -20°C to 40°C |
| Working humidity | 5% to 95% RH |
| Maximum charging current | 65A |
| Maximum discharging current | 70A |
| Expansion ports | 2 × expansion ports, 58.4VDC max., 90A max. |
| Warranty | 4 years |
| PR Solar category | BLUETTI > Expansion Battery |
What’s in the box?
This BLUETTI B500K expansion battery configuration includes:
- 1 × B500K Expansion Battery
- 1 × Battery Expansion Cable — P090A Long Cable
- 1 × User Manual
Frequently asked questions
How much capacity does one B500K provide?
One B500K provides 5,120Wh, or 5.12kWh, of battery capacity. The maximum total system capacity depends on the compatible BLUETTI power station and the number of batteries supported by that configuration.
Which BLUETTI power stations are compatible with the B500K?
Current BLUETTI Australia technical information lists Apex 300, AC200L, AC200MAX, AC300 and AC500 compatibility. B300K is also listed in the B500K compatibility specifications.
How long is the B500K designed to last?
BLUETTI specifies more than 4,000 battery cycles before the battery reaches 80% of its original capacity. Actual service life depends on operating conditions, temperature, charging patterns and depth of discharge.
Can the B500K be mounted permanently?
Yes. BLUETTI describes both fixed and movable installation options. The battery can be secured using its mounting points or used with the separately sold Foldable Trolley 2 where easier movement is required.
What cable is included with this B500K?
This configuration includes one P090A Long Battery Expansion Cable. Always verify cable requirements for the exact BLUETTI power station and installation before connecting the system.
Manufacturer information and PR Solar support
For current manufacturer compatibility notes, specifications and documentation, refer to the
official BLUETTI Australia B500K product page.
For help choosing a suitable expansion-battery setup, visit
PR Solar.
Product specifications and compatibility information are based on current BLUETTI Australia source information. Always confirm the final battery, cable and power-station configuration before installation.
