BLUETTI B500K1 5120Wh Expansion Battery, 5.12kWh LiFePO4 Module for Apex 300, AC300, and AC500 Home Backup Systems

The BLUETTI B500K1 Expansion Battery (B500K) is a heavy-duty energy storage module designed for large-scale home backup and off-grid solar systems. Boasting a massive 5,120Wh capacity, it is the highest-density expansion module in the BLUETTI lineup, offering nearly double the storage of the standard B300 series in a single unit.

Equipped with premium LiFePO4 cells, the B500K1 is built for longevity with a lifespan of over 4,000 cycles. Its advanced "Next-Gen Design Architecture 2.0" features a wireless internal layout that minimizes cabling, improving both reliability and thermal efficiency. This model is specifically designed for semi-permanent or mobile setups, featuring mounting holes for wall/rack installation and compatibility with BLUETTI’s heavy-duty trolleys.

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Key Features

• Massive 5.12kWh Capacity: A single unit provides enough energy to run critical home appliances (like a large refrigerator or well pump) for extended periods during an outage.

• High Scalability: Designed for ambitious setups. When paired with the Apex 300 or AC500 systems, you can chain multiple units together to reach a staggering 100kWh of total storage.

• Next-Gen Internal Architecture: The cable-free internal layout reduces failure points and makes the unit more compact and resilient to the vibrations of van life or travel.

• Superior Cold Resistance: Engineered to perform in harsh conditions, maintaining a stable discharge even in temperatures as low as -20°C.

• Universal Ecosystem Compatibility: Works seamlessly with the Apex 300, AC300, AC200L, and AC200MAX. It can also connect to the AC500 using a separate adapter cable.

• Direct DC Charging Hub: When used with the optional Hub D1 accessory, the B500K1 can serve as a high-capacity 700W DC power hub for RVs or off-grid cabins.

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Technical Specifications

Specification	Details
Battery Capacity	5,120Wh (5.12kWh)
Battery Type	LiFePO4 (Lithium Iron Phosphate)
Life Cycles	4,000+ Cycles to 80% Capacity
Max Charging Current	65A
Max Discharge Current	70A
Expansion Ports	2 × 58.4VDC (90A Max)
Operating Temp (Discharge)	-20°C to 40°C
Operating Temp (Charge)	0°C to 40°C
Weight	45 kg
Dimensions (L×W×H)	520 × 327 × 308.5 mm

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What’s in the Box?

1. BLUETTI B500K1 Expansion Battery

2. Battery Expansion Cable (P090A)

3. User Manual & Warranty Card