BLUETTI B300K Expansion Battery
Add 2,764.8Wh of BLUETTI LiFePO4 capacity to a compatible host power station.
- 2,764.8Wh expansion capacity — a large runtime upgrade for compatible BLUETTI systems
- LiFePO4 chemistry — designed for long service life and daily-use resilience
- 4,000+ cycle claim — listed by BLUETTI to 80% original capacity
- Host compatibility — AC200L, AC200MAX, AC300 and AC500
- 12W USB-A output — limited standalone charging for small devices
Use with a compatible main unit. Compatibility should be checked before ordering.
Out of stock
Is this expansion battery right for you?
Good fit if:
- You own a compatible AC200L, AC200MAX, AC300 or AC500
- You want longer runtime from an existing BLUETTI setup
- You understand it depends on a host unit for AC appliance power
- You need a high-capacity battery module rather than a second inverter
Not ideal if:
- You need a standalone AC power station
- Your BLUETTI host model is not listed for B300K
- You have not checked the required connection cable for your setup
B300K at a Glance
A Closer Look at the B300K
The important thing with B300K is dependency. It is a battery module first, not a power station replacement. Pair it with the correct BLUETTI host and cables, and it extends runtime for the devices connected to that host.
For customers comparing options, B300K makes most sense when the inverter and ports of the main BLUETTI unit already suit your needs, but the battery capacity does not.
Why it works for your setup
2,764.8Wh expansion capacity
a large runtime upgrade for compatible BLUETTI systems
LiFePO4 chemistry
designed for long service life and daily-use resilience
4,000+ cycle claim
listed by BLUETTI to 80% original capacity
Host compatibility
AC200L, AC200MAX, AC300 and AC500
12W USB-A output
limited standalone charging for small devices
No standalone AC output
appliances need a compatible host power station
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 the B300K a standalone power station?
No. It is mainly an expansion battery for compatible BLUETTI host systems and does not provide standalone AC sockets.
Which BLUETTI models does it work with?
BLUETTI lists AC200L, AC200MAX, AC300 and AC500 compatibility for this B300K version.
How much capacity does it add?
It adds 2,764.8Wh of LiFePO4 battery capacity to a compatible setup.
Can it charge a phone by itself?
Yes, for small devices through its limited 12W USB-A output. AC appliances still need the host power station.
What should I check before ordering?
Check the exact host model, cable requirement and any mixed-battery rules for your BLUETTI system.
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