BLUETTI B300K for Apex 300 Expansion Battery
Apex 300 expansion capacity with the same 2,764.8Wh B300K battery platform.
- 2,764.8Wh capacity — a serious runtime addition for compatible Apex setups
- LiFePO4 battery chemistry — designed for long-cycle battery use
- 4,000+ cycle claim — listed by BLUETTI to 80% original capacity
- Apex 300 variant — selected for the matching host system
- Expansion battery role — extends capacity through the host
Tracked UK delivery available, with support before and after purchase.
Out of stock
Is the B300K2 right for you?
Good fit if you want to:
- You are building around BLUETTI Apex 300
- You need more stored energy for an Apex 300 setup
- You understand this battery depends on a host system
- You want modular runtime rather than a second power station
Consider another setup if:
- You need a standalone AC power station
- You are extending AC200L, AC200MAX, AC300 or AC500 instead
- You have not checked the exact Apex 300 battery configuration
B300K2 at a Glance
A Closer Look at the B300K2
This is a compatibility-led product. The capacity looks the same as the standard B300K, but the listing is for Apex 300 use, so the host system matters more than the headline watt-hours.
For customers, the main decision is whether the Apex 300 platform is already the right base. If not, start with the main power station decision first.
Why it works for your setup
2,764.8Wh capacity
a serious runtime addition for compatible Apex setups
LiFePO4 battery chemistry
designed for long-cycle battery use
4,000+ cycle claim
listed by BLUETTI to 80% original capacity
Apex 300 variant
selected for the matching host system
Expansion battery role
extends capacity through the host
Standalone mains inverter
not included - not a power station on its own
Why Buy From VoltReady™
UK-Based Business
VoltReady is a UK-based portable-power specialist serving customers across the United Kingdom.
Manufacturer Warranty
Products include manufacturer-backed warranty cover, with the exact terms shown clearly on each product page.
Flexible Ways to Pay
Pay securely by card, Apple Pay, Google Pay, Klarna or Clearpay. Available options depend on your order and eligibility.
UK Customer Support
Get straightforward help before and after your purchase through live chat or email.
Everything important, clearly organised
Key Features
Technical Specifications
What’s in the Box
FAQs
Is this the same buying choice as the standard B300K?
No. This listing is for Apex 300 systems, so match it to the correct BLUETTI host platform.
Can it power AC appliances by itself?
No. It is an expansion battery and does not provide standalone AC output.
How much capacity does it add?
It adds 2,764.8Wh to a compatible Apex 300 setup.
Can it charge small USB devices?
The B300K platform includes a limited 12W USB-A output for small-device charging.
What should I compare it with?
Compare the host system first. If you are not using Apex 300, look at the battery specified for your BLUETTI model.
Shipping, Returns & Warranty
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