BLUETTI B300K Expansion Battery

BLUETTI B300K Expansion Battery | 2,764.8Wh

Nearly 3kWh of extra runtime, without replacing a thing

The BLUETTI B300K adds a massive 2,764.8Wh of LiFePO₄ storage to your compatible BLUETTI power station enough to keep a fridge, lights, fan, and router running through a long Jamaican outage without breaking a sweat. Instead of replacing your existing setup with something bigger, you plug the B300K in and your capacity grows. Simple as that.

For a country where the grid can drop for hours and electricity isn’t cheap, that extra nearly-3kWh of stored energy is the difference between riding it out comfortably and scrambling for alternatives.

2,764.8Wh of serious storage

Each B300K holds 2,764.8Wh enough to meaningfully extend the runtime of your power station across the devices that matter most during an outage or off-grid stay:

• Refrigerators and freezers
• Fans, lights, and Wi-Fi routers
• Laptops, TVs, and phones
• Power tools and small appliances

Whether you’re covering a multi-hour JPS outage or powering a weekend away from the grid, the B300K gives your system the depth to handle it.

Built to expand your BLUETTI system

The B300K connects seamlessly to compatible BLUETTI power stations, including the AC300 series. No complex wiring, no configuration plug in the expansion battery and your total storage scales up immediately. If your needs grow later, you can add more capacity without overhauling what you already own.

Solar-ready for off-grid power

Paired with a compatible BLUETTI system, the B300K charges from solar panels making it a natural fit for solar-powered homes, RV setups, off-grid cabins, and anyone building energy independence. Under the Jamaican sun, that means free daily recharging and extended backup that keeps topping itself up.

Works as a standalone power source too

The B300K isn’t just an add-on. It has its own built-in USB ports and a 12V DC output, so you can charge phones, tablets, routers, and small DC devices directly from the battery no power station needed for those smaller jobs. For anything larger, connect it to a compatible unit and the full system output is available.

LiFePO₄ built to last a decade

Inside are advanced LiFePO₄ cells rated for 3,500+ charge cycles the safe, stable, long-life chemistry that handles Jamaica’s heat and repeated daily cycling without degrading quickly. Built-in protection guards against overvoltage, overload, and overheating, so the battery performs reliably for years of regular use.

Tough enough for the field

Despite its large capacity, the B300K is engineered for real-world handling portable enough to move between setups, durable enough for demanding environments. It’s at home in a backup rack, an RV, a campsite, or a remote job site.

Specifications

Ideal for

• Extending home backup during long outages
• RV, van life, and mobile power setups
• Off-grid cabins and solar storage builds
• Long camping trips and remote work sites
• Powering multiple devices over extended hours

FAQs

How much capacity does the B300K add? It adds 2,764.8Wh to a compatible power station — a significant boost that extends runtime for fridges, lights, routers, and devices through long outages or off-grid stays. Exact runtime depends on your total load.

Which BLUETTI power stations work with the B300K? It’s designed for compatible models including the AC300 series. It connects and expands storage immediately with no complex setup. Always confirm your specific model is supported before purchasing.

Can the B300K work on its own, without a power station? Yes — its built-in USB and 12V DC ports let you charge phones, tablets, and small devices directly. For larger appliances, connect it to a compatible BLUETTI power station to access the full system output.

Does it support solar charging? Yes, when paired with a compatible power station and solar panels. Under Jamaican sun, that means free daily recharging — ideal for solar-powered homes, RV setups, and off-grid living.

How long will the battery last over years of use? Its LiFePO₄ cells are rated for 3,500+ charge cycles — roughly 10+ years of daily use under normal conditions. The chemistry is chosen specifically for longevity and stability in warm climates.

Do I need to replace my power station to get more capacity? No. The B300K expands your existing system — plug it into a compatible unit and your total storage grows without replacing anything. It’s a cost-effective way to scale up as your needs increase.

Can it handle heavy-duty use? When connected to a compatible power station, yes. The combined system can support multiple appliances and tools simultaneously over long durations — suited to both residential backup and demanding field use.

Is the B300K good for off-grid and RV use in Jamaica? It’s an excellent fit. The high capacity, solar compatibility, and heat-tolerant LiFePO₄ chemistry make it reliable for extended off-grid stays, RV setups, and anywhere you need stored power without a grid connection.

Downloads

📄 BLUETTI B300K Expansion Battery User Manual (PDF)

Add the capacity your system needs

The B300K is the straightforward way to get more runtime from the BLUETTI setup you already have more backup, more off-grid time, more peace of mind. Add it to your cart, and if you’d like help confirming compatibility or sizing your total system, get in touch and we’ll sort it with you.