BLUETTI B300K2 Expansion Battery Front View

BLUETTI B300K2 Expansion Battery | 2764.8Wh

Name: BLUETTI B300K2 Expansion Battery | 2764.8Wh
Brand: Bluetti
SKU: B300K2
Price: 969.0 USD
Availability: InStock

by Bluetti

SKU: B300K2

$969.00

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The BLUETTI B300K2 Expansion Battery Enhance Your Home Energy Solutions

The BLUETTI B300K2 Expansion Battery is an exceptional solution for expanding the power capacity of your BLUETTI AC300 or AC500, and APEX 300 portable power stations.

The B300K2 offers a substantial 2,764.8Wh additional capacity tailored to meet your diverse energy needs. Perfectly engineered to support your daily power requirements or serve as a steadfast backup during unexpected outages, it promises a seamless power experience that blends innovation with versatility.

IMPORTANT NOTES:

To connect to AC500, you need P150D to P090D cable cable and CA90 short cable.
To connect to AC300, you need P090A Long cable and CA90 short cable.
The above-mentioned cables are no longer available for purchase and no longer manufactured by Bluetti.

How the BLUETTI B300K2 Expansion Battery Makes a Difference

Unlike conventional expansion batteries, the BLUETTI B300K2 isn't just a storage add-on it’s a standalone power hub. With its integrated USB-A port, you can directly charge essential devices like smartphones, tablets, or fans. Whether you’re in a blackout or on a camping trip, power is always right at your fingertips.

Its compact, stackable design and plug-and-play compatibility allow for massive energy customization, expanding up to 33,177.6Wh when used with the AC500. This adaptability lets you tailor your setup to your specific energy demands, whether you're protecting your home or running gear in the wild.

BLUETTI B300K2 Battery Features

Massive Energy Capacity for Every Need

With a powerful 2,764.8Wh capacity, the BLUETTI B300K2 delivers reliable energy support for both everyday use and unexpected outages, ensuring you can power essential devices and maintain comfort without any interruptions.

Unmatched Battery Longevity with LiFePO₄ Technology

Featuring an automotive-grade LiFePO₄ battery, enjoy over 4,000 life cycles. This technology guarantees a longer lifespan and robust safety, providing peace of mind and reliable energy for years.

Effortless Integration for Seamless Compatibility

The B300K2 easily connects with AC300. AC500, and APEX 300 portable power stations, allowing you to enhance your setup and increase energy capacity to a whopping 33,177.6Wh. Expand effortlessly as your power needs grow.

Versatile Adaptability for Tailored Energy Solutions

Stackable with B300, B300K, and B300S models, the B300K2 adapts to fit your unique needs, whether at home or on adventures. Customize your energy supply and never worry about running out of power.

Built Tough with Superior Safety and Reliability

Crafted with a durable aluminum casing and innovative AI-BMS technology, the B300K2 withstands tough conditions. Its advanced wireless components and cooling features guarantee stable, safe operation through all scenarios.

Convenient USB Port for Essential Device Charging:

Stay connected on the go with the B300K2's USB-A port. Perfect for keeping your phones, tablets, and small appliances charged, it ensures you'll never be caught without critical power when needed most.

What's Included

1 x BLUETTI B300K2 Expansion Battery
1 x Battery Expansion Cable (CA90)
1 x User Manual

BLUETTI B300K2 Expansion Battery Warranty

BLUETTI provides a 3-year warranty policy, ensuring the absence of defects in materials, workmanship, and performance during the warranty period.

BLUETTI B300K2 Battery Specifications

Battery Specifications
Model	B300K2
Battery Capacity	2,764.8Wh (51.2V, 54Ah)
Battery Type	LiFePO₄ (Lithium Iron Phosphate)
Cycle Life	4,000+ cycles (to 80% capacity)
Output Specifications
USB-A Output	12W Max., 5V / 2.4A
Total Capacity	2,764.8Wh
General Specifications
Weight	29.5kg (65.04lbs)
Dimensions (L×W×H)	52.5 × 32.7 × 20.9 cm (20.67 × 12.87 × 8.23 in)
Charging Temperature	0°C to 40°C (32°F to 104°F)
Discharging Temperature	-20°C to 40°C (-4°F to 104°F)
Storage Temperature	Up to 1 month: -20°C to 40°C (-4°F to 104°F) Up to 6 months: -20°C to 25°C (-4°F to 77°F)
Working Humidity	5% to 95% RH
Charging Current	60A Max (may reduce outside optimal temperatures)
Discharging Current	70A Max
Expansion Ports	2 × Ports, 58.4VDC Max., 90A Max
Compatibility	AC300, AC500, APEX 300

BLUETTI B300K2 Battery Manual

This is my second Delta Pro Ultra! Bought to expand our home backup. Both units are connected to the Smart Home Panel 2

Best Price In Town

I do lots of research and Outbound Power had the best deal on what I needed. Surprise surprise. It shipped from the same warehouse as the manufacturer and the warranty works exactly the same. Glad to have found the site.

Hi RG,
Thank you for the kind words! We’re glad your research led you to us and that everything worked out as expected—from pricing to shipping to warranty coverage. We truly appreciate your support and hope you enjoy your new battery pack.

Works perfect!

Hi Philip,
Thank you for sharing — we’re glad to hear the Alternator Charger is working perfectly for you! We truly appreciate your support and hope it continues to serve you well.

Best,
Bill

Ecoflow Wave 3 purchase

I can honestly say Outboundpower Company exceeds their mission statement. The word that defines this organization is "Outstanding". The the Quality of products they sell is Outstanding. Their recent price matching is Outstanding by exceeding my expectations and truly customer focused. They really make a difference; a refreshing find these days. Their customers are definitely the most important part and purpose of their work.

In closing, I seldom offer reviews even when asked. However, I was motivated to expend the time and effort to recommend OutBoundPower without reservation; because they truly earned my respect. R. Kaiser

Thank you so much for your incredible review. We’re truly honored by your words. Our entire team works hard to deliver exactly the experience you described, and hearing that we exceeded your expectations means the world to us.

Price beating, product quality, and personal support are core parts of our mission, and it’s deeply gratifying to know they made a real difference for you. Reviews like yours remind us why we do what we do.

Thank you for taking the time to share your experience. Your trust and recommendation are sincerely appreciated. If there’s ever anything more we can do to be of service, we’re here and ready to help.

— Bill & the Outbound Power Team

Perfect

Perfect for what I needed it for.

Hi Stephen,

Really appreciate the great review — we’re thrilled the DELTA 3 Max was the perfect fit for your needs! Thanks for choosing Outbound Power.

If you ever have questions or want to expand your setup down the road, we’re always here for you.

Anker Solix C2000 gen 2 = GAME CHANGER

Just completed a 5 day hunting trip with my new Anker Solix C2000 gen 2 and I am so happy I pulled the trigger on this purchase! I ran all camper lights, fan and charged all of my various electronics (phone, iPad, camera batteries, hand warmers, etc…..) The power station was so much easier and more convenient than my generator. I intentionally used lights and things more than normal to test battery and only charged it once during the trip. I ordered the combo with the extra battery pack but did not receive the extra battery before my trip. Didn’t need it and don’t think I will need it on my hunting trips unless I decide to run an electric heater. Also got some use out of the power station at home today. We ran out of room to cook everything in the kitchen for our thanksgiving meal so I just hooked up our deep fryer to the power station and problem solved! 😁 Love the C2000 so far, excited to try to use it with a solar panel soon.

Thank you for taking the time to leave such a terrific review of your experience with the SOLIX C2000 Gen 2. We are so glad to hear that it was so helpful during your recent hunting trip. We apologize for the delay with the extra battery, but we are happy to hear that it wasn't needed on your trip. We hope you continue to find many uses for the C2000, whether it's on your hunting trips or at home for special occasions like Thanksgiving. We appreciate you!

Best Customer Service!

Thank you for your great website and customer service. I ordered an item that didn’t meet my specific situation, so requested a return. OP responded promptly with their approval and a return shipping label. Ordered another item that met my needs and it was shipped within a week. Great job guys!

Hi Big El,

Really appreciate the awesome 5-star review! Glad we could jump on the return quickly and get you the exact setup you needed. That’s how we like to do things—fast, friendly, and zero hassle.

Thanks again for rolling with Outbound Power. If you need anything at all, we’ve got your back!

Love it

Box was banged up , but no damage due to a well packaged product.
Delivered with 30% battery,
charged it up, tried a couple of outlets, and good to go !
Note: the 400w solar panel is way larger, and heavier, than I expected! Probably because I have a smaller one ,but don't know the wattage.
I still have trouble using the solar panel bag as a stand, but it'll be fine.

Hi Joseph,

Thank you for the 5-star review! We’re thrilled to hear you’re enjoying your EcoFlow DELTA 3 Ultra. It’s an incredibly capable unit, and we’re glad it’s meeting your expectations.

If you ever have questions about setup, accessories, or expanding your system, we’re always here to help.

Thanks again for choosing Outbound Power!

EcoFlow Dual Fuel 3200W/4000W Smart Generator 4000

Hi James,

Thank you so much for the 5-star review! We’re thrilled to hear you’re happy with your EcoFlow Dual Fuel Smart Generator 4000. It’s a powerful, reliable unit — a great addition to any backup or off-grid setup.

If you ever need help, have questions, or want to explore ways to expand your system, we’re always here for you.

Another Great Experience!

I have purchased over $20,000 of solar equipment from Outbound Power over several purchases. They have the best pricing and the best hands-on customer service. I always shop other sites but always end up back at Outbound Power. They are awesome!

Thank you, Richard! We’re truly grateful for your continued trust and for choosing Outbound Power for your home energy needs. It means a lot to us that you return each time after comparing options — our goal is always to offer the best prices and the most helpful, hands-on support. We appreciate you and look forward to assisting with your next project!