BLUETTI Apex 300 (3840W 2764.8Wh) power station stacked with BLUETTI B500K (5120Wh) battery.

BLUETTI B500K 5120Wh expansion battery with power indicator lights and textured design.

BLUETTI B500K 5120Wh portable expansion battery

BLUETTI B500K 5120Wh expansion battery for Apex 300

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Apex 300+B500K

Name: B500K Expansion Battery | Apex 300
Brand: BLUETTI
SKU: B500K2-UN-GY-SPFUS-00
Rating: 5 (10 reviews)

3,840W | 7,884.8Wh | 120V/240V | $0.41/Wh

Home Battery Backup

Apex 300+B500K

3,840W | 7,884.8Wh | 120V/240V | $0.41/Wh

7,884.8Wh: capacity
3,840W: Output
7,680W: Lifting Power

5.12 kWh, Lasts Up to 10 Years: Supplies reliable energy for years with over 4,000 cycles.
Scalable to 100 kWh: Easily expands your setup for partial, whole-home, or even small business backup.
Universal BLUETTI Compatibility: Works seamlessly with Apex 300, AC300, AC500, AC200L, AC200MAX, and upcoming models.
Part of a Smarter Power System: Pairs with SolarX 4K, Hub D1, and more for clean, connected energy.
More Durable & Safe: Wireless internal frame makes it resilient to real-world knocks and shocks.
Wall or Trolley Setup: Mount to save space or move with ease for flexible, convenient use.
Register HERE for an extended warranty

Your Power Station

3,840W | 7,884.8Wh | 120V/240V | $0.41/Wh

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BLUETTI B500K Expansion Battery | 5,120Wh

Your System

Cash Price*$0.00

If you have any questions?

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Up to 100 kWh Massive Expansion

Why Choose BLUETTI B500K?

Extend Your Backup Time

Adapt to All Your Needs

The B500K works with old, existing, or future BLUETTI power stations and expansion batteries.

Made It Safe, Reliable, and Long-lasting

The B500K adopts advanced LiFePO₄ batteries for over a decade of safe use. Its third-gen wireless internal design and efficient cooling fan ensure stable performance, even in challenging conditions.