BLUETTI B300K Expansion Battery, 2764.8Wh LiFePO4 Pack for Power Station AC200L AC300 AC500 AC200MAX, Extra Battery for Home, Emergency, Road Trip
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This item is eligible for return within 30 days of receipt
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Availability:
In Stock.
Arrives
Thursday, Jul 30
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Style: BLUETTI B300K for AC300
Features
- [Backward and Forward Compatibility] - Seamlessly works with past and future BLUETTI power stations featuring an expansion port, including AC200L, AC200MAX, AC300, AC500, and AC200PL. Ready for what's next.
- [Next-Generation Cells] - Equipped with advanced cells that provide at least 4,000 cycles to 80% capacity, offering a 15% boost in lifespan. Plus, they perform even better at high temperatures.
- [Next-Gen Design Architecture 2.0] - The B300K expansion battery pack's wireless internal design minimizes failure risk and maximizes space efficiency, resulting in a more compact, portable product.
- [Built-In USB Charging Port] - It's like having a massive power bank with a USB port, ready for those "just-in-case" moments. Connect it to any compatible BLUETTI power station for added versatility.
- [What You Get] - BLUETTI B300K expansion battery, P090A battery expansion cable for power station AC200L AC300 AC200MAX and user manual.
Connector Type: usb-a,usb-c
Brand: BLUETTI
Color: Black
Special Feature: electricitygenerator
Voltage: 120 Volts
Connector Type: usb-a,usb-c
Other Special Features of the Product: electricitygenerator
Voltage: 120 Volts
Power Source: Solar Powered
Amperage: 10 Amps
Portable: Yes
Compatible Devices: Laptop, Smartphone, Solar
Output Wattage: 500
Compatible Phone Models: LUETTI AC300, BLUETTI AC500, BLUETTI AC200MAX, BLUETTI AC200L, BLUETTI AC200PL
Reusability: Rechargeable
Number of Outlets: 3
Is Electric: Yes
Antenna Location: Home Backup/Off-grid/Emergency/RV/Camping/Outdoor
Item Weight: 65 Pounds
Unit Count: 1.0 Count
Item Dimensions: 20.47 x 12.6 x 10.31 inches
Battery Weight: 80 Pounds
Brand: BLUETTI
Model Name: B300K
Model Number: B300K
Number of Items: 1
Built-In Media: B300K battery, P090A battery expansion cable
Mfr Part Number: 4694987031
Number of Batteries: 1 Lithium Ion batteries required. (included)
Warranty Description: 4-year Warranty
Manufacturer: BLUETTI
Color: Black
Battery Cell Type: Lithium
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jul 30
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: BLUETTI B300K for AC300
Recently bought this Bluetti B300K to exoand my AC200Max. It over doubles the power of the AC200Max. It comes with the cable to connect it. Easy to hook up. The quality of build and materials is great! It charges only through beung plugged into your Bluetti solar generator that you plan to expand the battery power of. Once hooked up, you can charge them with solar panels, plug into an outlet. The B300K comes with only one USB-A type USB input. The power button must be held down for about 3 seconds to turn on. The lights are bright. It has 4 lights to represent the batter power of it. Each representing 20% of the power. And the power button lights up. This battery has a lifecycle of up to 3,500 charges from 0 to 100. After that, the battery will deplete 20%. Meaning you CAN STILL USE IT afte the 3,500 charges. And charge it from 0 to 80% of the battery's power for a long time. The functionality is easy and nice! The B300K weighs around 65lbs. But is easy to move around. The handles are sturdy. You can also see the battery percentage with the Bluetti app. And control several different Bluetti generator models with it.
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Reviewed in the United States on December 31, 2024 Reviewed in the United States on December 31, 2024 by Rezivor
Style: BLUETTI B300K for AC300
An xtra battery , plug and play right out of the box, plugs in to your portable power station to get xtra power, needed to get you through the night until the Sun comes out again, at $0.43 per Wh is an unbeatable price, almost 2800 Wh , cable is 32 inches long total, each connector is 4 inches and cable is 26 inches long, also update the firmware right away, very portable
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Reviewed in the United States on January 26, 2026 by JD
Style: BLUETTI B300K for AC300
I recently completed a solar setup with 6 ZOUPW 450W panels, the Bluetti AC500, and 3 B300K batteries, and I honestly couldn't be happier. The system has been performing phenomenally — I’m generating over 2.5kW of clean, reliable solar power, which keeps my essential loads running and charges the battery bank with no problem, even on partially cloudy days. The AC500 is the brains and brawn of the operation — it manages solar input effortlessly and distributes power to the batteries and devices with incredible efficiency. With over 9kWh of battery storage thanks to the 3 B300Ks, I’m confident we can run for extended periods completely off-grid if needed. The app interface, monitoring, and expandability make it feel like something straight out of a sci-fi movie. I haven’t even installed the Bluetti sub panel yet, which will allow me to supplement power directly to the house. Once that’s in place, I’ll be able to run high-demand appliances without even noticing we’re on solar. This system has turned my home into a quiet, self-reliant energy hub — no noisy gas generators, no fuel to store, and virtually no maintenance. If you're considering building a home backup or hybrid solar system, this combo is absolutely worth it. It’s powerful, scalable, and ready for any power outage or energy-conscious lifestyle. 10/10 would recommend!
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Reviewed in the United States on June 22, 2025 Reviewed in the United States on June 22, 2025 by Danielle Corsan
Style: BLUETTI B300K for AC300
I have been buying products from Bluetti for over a year. I am very happy with their sales, products and especially their service. I have communicated with them many times and get a very quick response. I have gotten to know many of the support people by their first names and I feel they know me an my needs personally. I own 1 AC300 solar generator, 5 B300 batteries, 2 B230 batteries, 1 AC200Max, 1 AC200P, 1 EB55 and 1 AC10. We live in the Palm Springs are where the most important part of electrical use is Air Conditioning. No A/C no survival. Our biggest fear here is a GRID DOWN situation due to a major earthquake or terrorist and/or war scenario or weather related. I study GRID SECURITY NOW! website that educates us to the possibility of losing our electricity for a long period time. I have over 23000 watt hours and 20 solar panels to keep my A/C window units and refrigeration and fans and communication alive. Sunday I watched 60 minutes and they did a series on THE GRID. This reinforced my plan to prepare for a scenario that would leave us without electricity for weeks or even months. My Bluetti equipment is here to save our lives if this were to happen. We are also stocked up with 6 months of food and water, TP and survival equipment along with Grid Down Bluetti survival Solar generators and Batteries and solar panels. At this time I use and test my Bluetti equipment every day. I use my AC200 Max and B230 batteries for television and fans. I use my AC300 and 4 B300 batteries for Window Air conditioning units that I use daily mostly after 4 pm and all through the night. Then I start charging them again in the daylight hours. If there is not sun (we get 300 days of sun a year here plus) I have a 7500 watt generator with propane or natural gas that will charge the batteries quickly and efficiently. I have a second 5000 watt generator (propane) as a backup. I also have 10 large propane bottles and a natural gas house hookup. I probably have $20,000 dollars invested in Bluetti products for survival and I look at it like insurance. My fire insurance costs me $1100 per year and my earthquake insurance costs me $1200 per year. Bluetti is my GRID DOWN insurance plus I use it daily to save electricity cost when electricity cost are rising at exorbitant rate with no sign of slowing. I am a prepper and survivalist and I feel Bluetti has the best quality product and my confidence in their backup and support make me and my family very secure. THANK YOU so much Bluetti Company and the entire Staff.
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Reviewed in the United States on February 28, 2022 by Jim a Kindle and Prime Customer
Style: BLUETTI B300K for AC300
Have 3 of these, and they do what they need to. I have 2 other expansion batteries, and an AC200L and an AC200MAX, and use these when we have electrical problems. I get them out about every 6 months and use them to run my refrigerator to drain and recharge everything, they recommend doing this. So, can't say anything about how many times you can recharge them, but they work great when I plug them in. Very happy to have them, as is my neighbor. I put one system at his house at night for his refrigerator and then recharge everything when he runs his gas generator during the day. Don't want to leave generator out at night because it could be stolen. And can charge faster than by panels when are stored when not in use. Helps both of us.
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Reviewed in the United States on November 7, 2025 by TL
Style: BLUETTI B300K for AC300
I bought this B300K because my electrical needs have begun to strain my AC200Max, which I have had to charge every day. Living in the Desert Southwest, we are approaching more cloudy days, meaning charging the AC200M will be more challenging, and my needs have only increased. I have been a Bluetti fan since my last solar battery, an orange one whose name starts with “J”, failed on so many levels, including two panels that completely stopped working after ONE. YEAR. I had a problem with my AC200M when it first came out; their customer service is exceptional, and the problem resolved (by exchanging the defective unit immediately) without complaint or delay. This B300K is plug-and-play, meaning all I had to do was plug it into my AC200M with the heavy cable provided, and presto, green lights! Because I was already charging, I did not even have to push the START button; it starts immediately when connected to solar. After a couple of days, the power in the two units balanced (automatically) and I no longer have to charge every day; I have much more available power in the setup. I have no reason to buy any solar battery or accessories from any other company. Well done, Bluetti. Very well done.
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Reviewed in the United States on November 5, 2024 by James W
Style: BLUETTI B300K for AC300
Fantastic addition to my Van power setup!
Reviewed in the United States on May 26, 2026 Reviewed in the United States on May 26, 2026 by Bill Deisz
Style: BLUETTI B300K for AC300
I purchased the Bluetti AC200P about a year ago. The intent was to have it provide some backup power during an outage but also to be used nightly to run a window AC unit. I can keep the rest of the house a little warmer and just cool the bedroom. I purchased one of the most efficient window units I could find and the AC200P was able to run it for about 6-7 hours during pretty warm nights. I also had to run the AC using grid power to pre-cool the room. I needed to expand the capacity of the AC200P so that I could run the AC unit longer. I also did not like running the AC200P down to zero every day. The B300 expansion battery provides the capacity I need to run the AC unit all night long. The B300 will also provides enough additional capacity to run the AC200P during power outages. I used to worry about buying one of these products and then seeing a newer and better product come out. With the B300, I know that I will still be able to use it in the future as I eventually hope to purchase another B300 and the AC300 to complete a system for my future needs at an off-grid cabin. And from what I've read, Bluetti will offer future products that will be backwards compatible for B300 usage. I was concerned about having a big item with sensitive components shipped, but the B300 came packaged really well with a box within a box and thickly padded foam inserts. Even the outside box also had stiff cardboard edge supports to help during transit. Overall, I am very satisfied with the B300 as I've been running test charges on it and using it to supplement my AC200P to power various items.
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Reviewed in the United States on March 21, 2022 Reviewed in the United States on March 21, 2022 by Marty P