BLUETTI B500K Expansion Battery for AC200L AC300 AC500 AC200MAX Portable Power Station, 5120Wh LiFePO4 Battery Pack, Solar Generator for Home, Emergency, Off-Grid (Expansion Cable P090A Included)
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Availability:
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Monday, Jun 8
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Style: BLUETTI B500K for AC300/AC200L
Features
- [Scalable Capacity Expansion] - 5120Wh per pack with 4,000+ cycles to 80% capacity. Expand up to 6 B500K per Apex 300. 3 Apex 300 with 18 B500Ks achieve an incredible 100kWh capacity.
- [Widely Compatible] - B500K works with past and future BLUETTI portable power stations including AC200L AC200MAX AC300 AC500 and Apex 300. This listing includes a P090A cable compatible with most power stations. AC500 requires a separate P150D cable.
- [Next-Gen Design Architecture 2.0] - The B500K expansion battery bulit with a cable-free internal layout, wireless internal structure lowers failure risks and saves space, resulting in a more compact, easy-to-move product.
- [Usage Ecosystem] - Beyond capacity expansion, the B500K works with BLUETTI accessories for versatile charging and discharging: SolarX 4K (4000W), Alternator Charger (560-1000W), Hub D1 (700W DC), and future accessories.
- [What You Get] - BLUETTI B500K expansion battery, P090A-P090A battery connection cable, and user manual.
Brand: BLUETTI
Recommended Uses For Product: Home Backup/Off-grid/Emergency/RV/Camping/Outdoor
Voltage: 120 Volts
Model Name: BLUETTI B500K+P090A
Item Weight: 99.2 Pounds
Brand: BLUETTI
Model Number: B500K
Model Name: BLUETTI B500K+P090A
Manufacturer: BLUETTI
Built-In Media: BLUETTI B500K+P090A
Voltage: 120 Volts
Item Weight: 99.2 Pounds
Antenna Location: Home Backup/Off-grid/Emergency/RV/Camping/Outdoor
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Jun 8
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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Similar Products
Top Amazon Reviews
Style: BLUETTI B500K for AC300/AC200L
My Review of the BLUETTI B500K Expansion Battery. The BLUETTI B500K is a solidly built, no-frills 5,120Wh (5.12 kWh) LiFePO4 expansion battery—well-made and reliable. I’ve found BLUETTI consistently outperforms more hyped brands in the portable power space. I’ve owned an AC300 for nearly 5 years, and their customer support has been exceptional—friendly, knowledgeable (the reps often seem like engineers), and quick to resolve issues. BLUETTI’s edge comes from using LiFePO4 cells: over 4,000 cycles to 80% capacity means 10+ years of daily use, with better safety (no thermal runaway risk) than standard lithium-ion alternatives. At (promo price, it delivers excellent value at about $380 per kWh with the promo pricing that comes up often, it’s competitive-with EcoFlow or Anker options, especially factoring in longer life and broad compatibility (AC300, AC200L/MAX, AC500, Apex 300). Stack up to six per unit for massive scaling (up to 100 kWh systems). The hardware stays straightforward, but the BLUETTI app adds real utility: real-time SOC, power input/output, historical charts for solar generation vs. usage, and trends over time. This helps optimize—avoid wasting excess solar when batteries fill, adjust loads to maintain healthy charge levels, or prep better for outages by tracking patterns. It connects via Bluetooth or WiFi/cloud and has improved significantly. Not the lightest (~99 lbs) for moving, but perfect for stationary home backup or off-grid setups tied to my AC300—it doubles capacity seamlessly and powers essentials for days. If you’re in the BLUETTI ecosystem or building expandable storage, the B500K is a smart, cost-effective upgrade. BLUETTI keeps delivering where it matters
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Reviewed in the United States on January 27, 2026 by David
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
I have 6 different Bluetti products and I have not had any problems. They may not be the cheapest but so for they have been the best quality and that makes all the difference. Most times you get what you pay for. I'd rather pay just a little more and not have any problems than try to cheap out on inferior products that have issues.
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Reviewed in the United States on February 26, 2026 by KYLE BANTZ
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 by Danielle Corsan
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
The media could not be loaded. 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 by Rezivor
Style: BLUETTI B500K for AC300/AC200L
Great addition to my solar batteries
Reviewed in the United States on April 11, 2026 by LT