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BLUETTI

BLUETTI Expansion Battery B300K×2, 5529.6Wh LiFePO4 Battery Pack for Power Station Apex 300 Only, Extra Battery for Home, Emergency, Road Trip

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Availability: In Stock.
Fulfilled by Bluetti
Arrives Wednesday, Jun 10
Order within 12 hours and 25 minutes
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Style: BLUETTI 2xB300K


Features

  • [Universal Expansion Compatibility] - B300K links smoothly to Apex 300 via its expansion port, letting you upgrade capacity flexibly to fit any situationno hassle, just seamless power scaling.
  • [Next-Generation Cells] - Boasts advanced cells with 4,000+ cycles to 80% capacity, boosting lifespan by 15%. They also hold up better in high temps, keeping performance steady when its hot.
  • [Next-Gen Design Architecture 2.0] - B300Ks wireless internal setup cuts down on failure chances and saves space, making this expansion battery pack more compact and easier to carry.
  • [Built-In USB Charging Port] - Doubles as a huge power bank with a USB port, perfect for unexpected needs. Pair it with any compatible BLUETTI power station to add extra versatility to your setup.
  • [What You Get] - BLUETTI expansion battery B300K2, CA90 battery extension cable for solar generator Apex 300 and user manual.

Brand: BLUETTI


Battery Cell Composition: Lithium Ion


Recommended Uses For Product: Home Backup/Off-grid/Emergency/RV/Camping/Outdoor


Unit Count: 1.0 Count


Voltage: 120 Volts


Brand: BLUETTI


Model Number: B300K


Manufacturer: BLUETTI


Built-In Media: BLUETTI 2 B300K Batteries


Warranty Description: 5 Year Manufacturer


Voltage: 120 Volts


Reusability: Rechargeable


Unit Count: 1.0 Count


Battery Weight: 84 Pounds


Item Weight: 65.04 Pounds


Antenna Location: Home Backup/Off-grid/Emergency/RV/Camping/Outdoor


Battery Cell Type: Lithium Ion


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jun 10

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Very capable upgrade.
Style: BLUETTI 2xB300K
I’ve already had a couple of BLUETTI 3000 units with single batteries for each. Unfortunately, by the time I was ready to expand the capacity, I couldn’t find any of the matching batteries. I went ahead and ordered an Apex 300 with this pair of batteries combined. I really like the design of the battery connectors, which minimizes the space needed and prevents unnecessary/accidental damage to the cables in passing those big loops. I am using this setup as a backup to my gas furnace at the farm. I can quietly use it all night long during a power outage and then fire up the loud generator during the day if needed. The smaller capacity BLUETTI system which I was previously using for this was repurposed for duty in the storm shelter/root cellar. I know you can buy bigger systems for less, but it’s hard to beat this simplicity, modularity and portability in a reliable and capable system. ... show more
Reviewed in the United States on February 9, 2026 by Michael Bruce

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