Buy Now, Pay Later
As low as
/ mo
Learn more
- – Up to 36-month term if approved
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
Non-returnable item
Learn more
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Availability:
In Stock.
Arrives
Tuesday, Oct 6
Recently Viewed
Set name: BLUETTI B300K for AC500
Features
- [Universal Expansion Compatibility] - B300K hooks up effortlessly to Apex 300 through its expansion port, letting you adjust capacity freely for any scenarioseamless power growth, no fuss involved.
- [Next-Generation Cells] - Features advanced cells with 4,000+ cycles to 80% capacity, extending lifespan by 15%. They shine in high temperatures too, keeping performance strong when its warm.
- [Next-Gen Design Architecture 2.0] - The B300K expansion batterys wireless internal structure lowers failure risks and saves space, resulting in a more compact, easy-to-move product.
- [Built-In USB Charging Port] - Acts like a giant power bank with a USB port, ideal for surprise needs. Connect it to any compatible BLUETTI power station to boost your setups versatility.
- [What You Get] - BLUETTI B300K expansion battery, P090D-P150D (shipped separately), CA90 Battery Extension Cable for Solar Generator Apex 300 and user manual.
Description
BLUETTI B300K for Apex300 BLUETTI Elite 100 mini BLUETTI Elite 100 V2 BLUETTI Elite 200 V2 BLUETTI Elite 300 BLUETTI Elite 400 BLUETTI Apex 300+B300K What power station can the B300K be connected with? B300K can be connected to BLUETTI power station models: AC200L, AC200MAX, AC300, etc. However, this B300K with CA90 battery extension (short cable) can only be connected to Apex 300. What's the recharging ways of B300K? B300K's charging input power matches that of the connected host power station, allowing it to be charged simultaneously with the host through wall chargers, solar panels, car chargers, or generators. Can the B300K battery module be used alone? Yes. B300K features an 12W USB-A making the battery module works flawlessly when standalone. B300K & portable power station charge together, reaching 80% in 45 min. Does this mean both reach 80% at the same time? "80% charging in 45 minutes" refers to the B300K's maximum charging capacity. If the energy storage device's input power is insufficient, it will not be possible to charge both devices to 80% in 45 minutes.
Brand: BLUETTI
Wattage: 2764.8 watt-hours
Fuel Type: Electric
Power Source: Solar Powered
Recommended Uses For Product: Home Backup/Off-grid/Emergency/RV/Camping/Outdoor
Item Weight: 65 pounds
Voltage: 120 volts
Special Feature: electricitygenerator
Included Components: BLUETTI B300K Power Station, P090D-P150D Cable (shipped separately)
Product Dimensions: 20.67"L x 12.87"W x 8.23"H
Wattage: 2764.8 watt-hours
Fuel Type: Electric
Power Source: Solar Powered
Recommended Uses For Product: Home Backup/Off-grid/Emergency/RV/Camping/Outdoor
Voltage: 120 volts
Additional Features: electricitygenerator
Item Weight: 65 pounds
Item Dimensions L x W x H: 20.67"L x 12.87"W x 8.23"H
Brand Name: BLUETTI
Included Components: BLUETTI B300K Power Station, P090D-P150D Cable (shipped separately)
Model Number: B300K+P090D-P150D
Item Highlight: for Portable Power Station AC500, Extra Battery for Home, Emergency, Road Trip
Unit Count: 1 Count
Manufacturer: BLUETTI
Manufacturer Part Number: B300K+P090D-P150D
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Oct 6
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Set name: BLUETTI B300K for AC300
I have been using the Bluetti AC200P for about a year. It’s been faultless in this time and the only thing I wanted was to add additional battery power. Hopefully, this is at least in part resolved by the B300. I connected it to the AC200P through the solar input and a cable that Bluetti provided free of charge. Once you hold the power button down (it did take me a while to work that out!), it charges the AC200P at about 600W. Which is more than enough. I’ve attached some photos (excuse the mess!) and the two units are strapped securely into a “tray” I made for them. I have my AC200P plugged in to a 12V fusebox with the 25a output. This powers my fridge, heater, water pump, lights etc. In an ideal world, I would have the AC200MAX which enables you to treat the AC200 and the additional B300 (or B230) as one battery and will charge with one input and see everything on the display. Unfortunately, with the AC200/P you are a little more limited. But I’ve been happy with my AC200P and didn’t really see the point of upgrading to the MAX just for this convenience. I have it set up in my camper van with as mentioned, everything plugged into the AC200P with all the charging going into the B300 via a fixed solar panel into the B300 DC input and it also charges from the engine via Bluetti’s DC charge enhancer at the same time. Hopefully, this will keep the B300 charged up and the AC200P charged as a result. The only issue with this setup is that you cannot see the solar input going in on the AC200 display. The on-board solar charging is a good reason to go for the B300 over the B230 in my opinion. In my experience, powering everything mentioned above, I use about 900WH a day. This means I should get 5/6 days of completely off-grid power without any solar or charge from the engine in winter. As an additional note, I have heard of many of the first batch of these being damaged by couriers. I am pleased to report that I had no such issue and it all seems to have arrived free from damage. Overall, I’ m pretty happy and it’s doing exactly as described by Bluetti. Giving my 5KWH of battery power. Although it would be nice to have the MAX, the way Bluetti have tried to make it as backwards compatible as possible is appreciated and means I’m more likely to upgrade when the time comes.
...
show more
Reviewed in the United States on March 9, 2022 by Kate T.
Set name: 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!
...
show more
Reviewed in the United States on June 22, 2025 by Danielle Corsan
Set name: BLUETTI B300K for AC300
Works great, added it to a system with an existing AC300+B300. There was some uncertainty about whether the B300K was compatible with that existing setup but it was plug and play! Very Pleased.
Reviewed in the United States on July 7, 2026 by Nick
Set name: BLUETTI B300K for AC300
Like there products best out there
Reviewed in the United States on August 12, 2026 by Jerry
Set name: 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
...
show more
Reviewed in the United States on January 27, 2026 by David
Set name: BLUETTI B300K for AC300
I bought 2 B300 batteries for my AC200MAX and while the batteries are nice, I can't see them since they face the wall. The B300 battery was made for the AC300 and AC500 which have battery connectors on the right side. The connectors on the AC200MAX are on the left side, and the battery cables are too short to go from the left to the right connectors. So, my batteries have to face the wall. Bluetti, in its lack of thought - does not have a 3-foot "extension cord" to fix the situation (not that I asked but searched the web site). This review only gets 4 stars since the power button is also in (front) back of the B300 so is hard to turn on and I have to press the button (on both) to turn it on. My components are stacked to take up minimal space. The B300 has 4 battery connectors on the right and none on the left. The only way Bluetti gets 5 stars is if they send me the 3-foot extension to make one cord longer or send the full 6-foot battery cable.
...
show more
Reviewed in the United States on January 29, 2023 by Michael See
Set name: 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.
...
show more
Reviewed in the United States on February 28, 2022 by Jim a Kindle and Prime Customer
Set name: 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.
...
show more
Reviewed in the United States on November 5, 2024 by James W