The BLUETTI B500K Expansion Battery delivers a massive 5,120Wh of LiFePO₄ energy storage, giving you the power to run your home through outages, storms, or off-grid living. Engineered as the next evolution beyond the B300K, it lowers the cost-per-watt-hour while scaling your system farther than ever before.
Compatible with the Apex 300, AC300, AC500, AC200L, AC200MAX, and more, the B500K integrates seamlessly into your existing BLUETTI ecosystem. Stack up to 18 units with three Apex 300 power stations to reach a staggering 100kWh of whole-home backup capacity.
Key Features
5,120Wh Capacity — 10+ Year Lifespan: Over 4,000 cycles of clean, reliable energy storage.
Scalable to 100kWh: Expand from partial-home to full whole-home or small business backup.
Universal BLUETTI Compatibility: Works with Apex 300, AC300, AC500, AC200L, AC200MAX, and upcoming models.
Smart Ecosystem Ready: Pairs with SolarX 4K, Hub D1, and more for connected, clean energy.
Durable & Safe: Wireless internal frame is resilient to real-world knocks and vibrations.
Flexible Mounting: Wall-mount to save space or use the trolley for easy mobility.
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
5,120Wh
Battery Type
LiFePO₄ (Lithium Iron Phosphate)
Cycle Life
4,000+ Cycles
Estimated Lifespan
10+ Years
Compatible Systems
Apex 300, AC300, AC500, AC200L, AC200MAX
Max Scalability
Up to 100kWh (18 units + 3x Apex 300)
Mounting Options
Wall or Trolley
Weight
45 kg (99 lbs)
Brand
BLUETTI