Editor's Take

The 2*B500K expansion pack is a straightforward way to boost the Apex 300’s storage, giving users noticeably longer backup times. At $3,998 it isn’t cheap, but BLUETTI’s reputation for solid power products makes the cost understandable for serious backup needs. It stands out simply by being a modular add‑on rather than a full‑size generator replacement.

Who is this for?

Ideal for current Apex 300 owners who need extra runtime for home or small‑business backup, especially where power outages are frequent.

Content reviewed September 11, 2026

$3,998.00

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Quick Verdict & Overview

Pros

Expands storage capacity of the Apex 300
Allows longer backup runtime without replacing the main unit
From reputable brand BLUETTI known for reliable power solutions
Pack of two batteries gives flexibility for modular scaling
Transparent pricing with no hidden fees

Considerations

High upfront cost of nearly $4,000
Only useful if you already own an Apex 300; not a standalone solution
No detailed specs provided, making capacity planning harder
Physical size and weight may be substantial for portable use

Editor's Take

Who is this for?

Ideal for current Apex 300 owners who need extra runtime for home or small‑business backup, especially where power outages are frequent.

Frequently Asked Questions

Can the 2*B500K expansion provide enough power to run a typical home office setup for 24 hours?

The dual B500K modules add a significant amount of stored energy, which can extend the Apex 300’s runtime well beyond its base capacity. However, without exact kWh figures it’s hard to guarantee a full 24‑hour operation for a typical office load, so users should calculate their own consumption first.

Is this battery pack suitable for powering an entire house during a prolonged outage?

While the added capacity helps, the B500K modules are designed as an expansion rather than a whole‑home solution. For a full house you’d likely need multiple units or a larger system, so this pack would fall short for that scale.

Is $3,998 a reasonable price for the extra capacity the 2*B500K provides?

At just under $4,000 the price reflects both the brand’s quality and the substantial increase in stored energy. For users who value reliable, modular backup, the cost can be justified, but budget‑conscious shoppers may find it steep compared to smaller UPS options.

How easy is it to install the 2*B500K expansion onto an existing Apex 300?

Installation is generally plug‑and‑play; the modules connect directly to the Apex 300’s expansion ports. They are typically heavy for portable use, and BLUETTI offers a standard warranty, so handling and warranty considerations should be kept in mind.

Who it's not for

This isn't for you if you don't already own an Apex 300 or are looking for a standalone power solution.

Product Description

Dual B500K expansion batteries for Apex 300, increasing total storage capacity for extended backup runtime.

Product Information

Product Name	2*B500K for Apex 300
Category	Dual Purpose Batteries \| Dual Purpose Batteries
Brand	Bluetti \| Bluetti
Store	Bluetti Global \| Bluetti Global
SKU	CJ-cj_6191107_B500K2-2-07-SPFUS-00
Currency	USD

2*B500K for Apex 300

Editor's Take

Who is this for?

Trusted product & store guidance

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Bluetti Global

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Quick Verdict & Overview