Bluetti B500K Expansion Battery

At the heart of every Bluetti Expansion Battery system lies the chemistry that defines its soul. The B500K is built upon advanced Lithium Iron Phosphate (LiFePO₄) cells, a decision that prioritises safety, stability, and endurance over mere capacity. With a substantial base capacity of 5,120Wh, this unit alone can power essential home appliances during an outage, run a campsite’s worth of gear for days, or keep critical tools and computers operational off-grid.

However, the true marvel is its endurance. The B500K is rated for 4,000+ life cycles to 80% of its original capacity. To contextualise this engineering feat: if you performed a full cycle every single day, this battery would retain 80% of its capacity for over a decade. This extraordinary cycle life translates directly into a lower total cost of ownership and a sustainable power solution that stands the test of time, making it not a purchase, but a long-term investment in energy independence.

Limitless Scale: The Architecture of Massive Expansion from 5.12kWh to 100kWh+

The term “expansion” is often used loosely, but the Bluetti B500K Expansion Battery defines it literally. This is where the product transcends from a capable power station into a legacy energy system. The B500K’s core design principle is modular scalability. You are not buying a fixed solution; you are investing in an open-ended platform.

Start with a single B500K paired with a compatible BLUETTI power station like the AC500 or Apex 300 for substantial backup power. As your needs grow, perhaps adding a home solar array, outfitting an RV for full-time travel, or securing a remote worksite, you simply add more B500K units. The system architecture allows for a massive expansion up to and beyond 100kWh of stored energy*. Imagine powering an entire home’s critical loads for days during an outage or creating a self-sustaining microgrid at a remote location. This scalable nature future-proofs your investment, ensuring your power system evolves with your life’s demands.

*Achieved with 3 Apex 300 and 18 B500K units.

Universal Compatibility: The Centerpiece of the BLUETTI Ecosystem

A versatile Off-Grid Battery is only as valuable as its ability to integrate. The BLUETTI B500K is engineered as the unifying backbone for high-performance power stations. It is compatible with a wide range of flagship BLUETTI units including the AC200L, AC200MAX, AC300, AC500, and Apex 300, as well as the B300K expansion battery. This universal compatibility allows for easy, cost-effective upgrades. Instead of replacing your entire system, you seamlessly augment its storage capacity, protecting your initial investment and building upon a trusted foundation.

This plug-and-play compatibility underscores BLUETTI’s ecosystem approach, where the B500K acts as a central energy reservoir for multiple input and output pathways, creating a cohesive and powerful energy management network.

Multifunctional Operation: More Than Just an Expansion Unit

While its primary role is expanding power stations, the B500K’s functionality is ingeniously multifaceted. Independently, it can serve as a high-capacity, stationary power bank. When integrated with specific BLUETTI ecosystem components, its capabilities multiply:

• Ecosystem Home & Off-Grid: Connect to the SolarX 4K input module to harvest up to 4,000W of solar input, turning sunlight into a torrent of storable energy for your home or cabin.
• Mobile Charging: Utilise the Alternator Charger to replenish the battery at up to 1,000W from your vehicle while driving, perfect for overlanding or cross-country RV trips.
• DC Power Supply: Pair with the Hub D1 to unlock a stable 700W Max DC output, directly powering demanding DC appliances or creating a dedicated low-voltage workspace.

Note: Certain cables, like the P090D to P150D for AC500 connection, and accessories like the Hub D1 are sold separately to provide customisable configurations.

Engineered for Decades: Advanced Safety and Stable Performance

The promise of a 4,000-cycle life is underpinned by robust engineering. The B500K utilises the inherently stable and safe LiFePO₄ chemistry, which is resistant to thermal runaway, providing peace of mind for use in homes, vehicles, and around families. Its third-generation wireless internal design reduces failure points and simplifies the architecture, while the integrated efficient cooling fan actively manages temperature. This ensures stable, high-performance output and longevity even under heavy loads or in challenging environmental conditions, from desert heat to humid climates.

Flexible Installation: Secure or Mobile Power Solutions

Your power infrastructure should adapt to your location, not the other way around. The BLUETTI B500K is designed for unparalleled installation flexibility. Its chassis includes strategic mounting holes, allowing you to securely fasten it to a wall in a garage, inside a utility cupboard, or within an RV rack for a permanent, space-saving setup.

For mobile applications, attach the B500K to the optional Foldable Trolley 2*, transforming this energy reservoir into a movable power supply. Easily roll it from your RV to an outdoor worksite or reposition it around your home as needs change. This duality of fixed security and mobile convenience ensures the B500K fits seamlessly into any lifestyle.

*Foldable Trolley 2 sold separately.

BLUETTI B500K Expansion Battery – Scale Your Power, Define Your Independence

The Bluetti B500K Expansion Battery is more than a component; it is the critical building block for anyone serious about taking control of their energy destiny. It answers the core challenges of capacity anxiety and system obsolescence with its massive scalable storage, legendary LiFePO₄ lifespan, and deep ecosystem integration. It is the definitive solution for whole-home outage protection, the enabling technology for limitless adventure, and the reliable foundation for productive off-grid working.

Backed by a confident 4-Year Warranty, the B500K is built to last and designed to grow. Choose the Bluetti B500K Expansion Battery not just to power your devices, but to empower your vision of an independent, resilient, and unbounded life. Scale your power and define your independence.

What’s In the Box?

• For Apex300 – B500K LiFePO₄ Battery Pack, CA90* Battery Expansion Cable (270 mm/10.62 in)
• For AC200L / AC300 – B500K LiFePO₄ Battery Pack, P090A* Battery Expansion Cable (800 mm/31.49 in)
• For AC500 – B500K LiFePO₄ Battery Pack, P090D-P150D* Battery Expansion Cable (800 mm/31.49 in), CA90* Battery Expansion Cable (270 mm/10.62 in).