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BLUETTI B500K · Universal Expansion Battery · 5,120Wh
The B500K is a 5,120Wh LiFePO₄ expansion battery built for universal compatibility — Apex 300, AC300, AC500, AC200L, AC200MAX, and upcoming models all work with it, rather than being locked to one specific system. Rated for over 4,000 cycles (roughly a decade of use), it scales up to 100kWh combined, mounts to a wall or rack, and pairs with BLUETTI's SolarX 4K and Hub D1 accessories for a more connected setup.
BLUETTI's own "Universal Compatibility" positioning — one battery, multiple power station platforms.
Portable
Extends the Apex 300 platform's already-modular capacity further.
Commercial
Whole-home and small commercial backup platforms with real expansion headroom.
RV / Home
Popular mid-size power stations, plus BLUETTI's stated support for upcoming models too.
Substantial capacity added to whatever BLUETTI power station it's paired with.
Works with Apex 300, AC300, AC500, AC200L, AC200MAX, and BLUETTI's stated upcoming models.
Rated for over a decade of service, not just occasional emergency use.
A third-gen internal design built to be more resilient to real-world knocks and shocks.
Mount to save space, or pair with the separately-sold Foldable Trolley 2 for a mobile setup.
Keeps performance stable even under challenging operating conditions.
Combine multiple units for partial, whole-home, or small business backup.
Pairs with SolarX 4K and Hub D1 for a more integrated setup beyond just extra storage.
Most BLUETTI expansion batteries are built for a specific platform — B300K for Apex 300, B4810 for RV5-based 48V systems, B500 exclusively for EP800/EP900 home ESS. The B500K takes a different approach: BLUETTI markets it with "Universal Compatibility," working across Apex 300, AC300, AC500, AC200L, AC200MAX, and models still to come. That flexibility matters if a system might change platforms later, or if the same battery needs to serve more than one type of power station over time.
Physically, it's built to be moved or fixed in place depending on the setup — mount it to a wall or rack for a permanent install, or pair it with the separately-sold Foldable Trolley 2 for something more portable. A third-generation "wireless internal" design and dedicated cooling fan are meant to hold up to real-world knocks and challenging conditions better than earlier designs, and it connects into BLUETTI's broader ecosystem through accessories like SolarX 4K and Hub D1. Warranty coverage requires registering the product after purchase — BLUETTI's own FAQ confirms this step, though the base coverage length itself wasn't stated.
B500K Expansion Battery
| Total energy | 5,120 Wh |
| Chemistry | LiFePO₄ |
| Cycle life | 4,000+ cycles |
| Estimated lifespan | ~10 years |
| Internal design | 3rd-gen "wireless" frame |
| Cooling | Dedicated fan |
| Mounting | Wall/rack, or Foldable Trolley 2* |
| Compatible power stations | Apex 300, AC300, AC500, AC200L, AC200MAX, upcoming models |
| Ecosystem accessories | SolarX 4K, Hub D1 |
| Max combined capacity | 100kWh |
| Warranty | Registration required to claim** |
*Foldable Trolley 2 sold separately. **BLUETTI's own FAQ confirms a registration step is required to claim warranty, but doesn't state the base coverage length — the live page's Tech Specs tab was not accessible in a static fetch, so weight, dimensions, and exact charge/discharge current aren't included here rather than guessed.
Register the product on BLUETTI's website after receiving it — this is confirmed directly in BLUETTI's own FAQ as the required first step to claim warranty coverage.
Apex 300, AC300, AC500, AC200L, AC200MAX, and BLUETTI's stated upcoming models — marketed as "Universal BLUETTI Compatibility" rather than being locked to one platform.
Not confirmed in available sources — this varies by which power station it's paired with, and BLUETTI's own FAQ raises this exact question for AC300 and Apex 300 specifically without a visible published answer. Worth confirming the exact number for your specific setup directly with BLUETTI before purchase.
Not confirmed — BLUETTI's own FAQ asks this exact question (mixing B500K with B300K, B300, or B300S) without a visible published answer. Don't assume compatibility for mixed setups without checking directly.
Up to 100kWh combined, per BLUETTI's own stated maximum — enough for partial, whole-home, or small business backup depending on how many units are connected.
Yes — wall or rack mounting is standard, and it can also attach to BLUETTI's Foldable Trolley 2 (sold separately) for a more portable setup.
I added this battery after the recommendation of support instead of getting the new battery for refrigerators. I have the Apex 300 with two B300 and this one B500. I get almost 1.5 weeks without recharging. It runs my fridge, TV, Internet, small washing machine, and multiple chargers for my tools. Considering purchasing an additional B500.
(Review from www.bluettipower.com)
Thus far the unit is performing as expected. Only complaint is my AC200L does not recognize the B500K model/serial numbers on the app.
(Review from www.bluettipower.com)
Very easy to connect and it works perfectly with the Apex 300. I love having the extra storage that’s for sure. 👍
(Review from www.bluettipower.com)
Working well for my application
(Review from www.bluettipower.com)
The battery is Awesome!!!
(Review from www.bluettipower.com)
B500K for Apex 300
(Review from www.bluettipower.com)
So far so good. I haven’t actually had an opportunity to put it in operation yet, no power outages or RV trips taken. Saying that, the setup was simple. Plug the B500K into the Apex and the Apex into the wall outlet and then just watch the app as everything got charged to 100%. Simple. Same thing with my second B500k. Just added it to the Apex and first N500K and Presto! Everything‘s up and running smoothly. Tried it out the outlets on the Apex. Everything was perfect. Can’t wait to put it all to the test in the RV.
(Review from www.bluettipower.com)
Now my Apex 300 is even better with this B500K
(Review from www.bluettipower.com)
Love this thing. Exceeded expectations
(Review from www.bluettipower.com)
No
(Review from www.bluettipower.com)
Henry was remarkably helpful during some difficult times with my AC300 system. Extensive back and forth troubleshooting identified the problem and a solution quickly arrived at that kept my system operational until the needed part could arrive. In that interim I decided to upgrade to the Apex300 system and again Henry was helping identifying the key differences between the systems, identifying what components were not cross compatible, and walking me through the trade in process for items that could be traded in.
Basic Apex300 system is operational, awaiting installation of the more advanced components (Hub, etc. ).
When I decided to explore the Apex300, there was little detail on the Bluetti site regarding how the various components interact, or could be expanded. Through lengthy web searches I happened upon a detailed video (by Bluetti) depicting several very specific configurations. That was immensely helpful.
When looking for accessories on your web site, it would be most helpful if I could identify the system I have and then see a complete list of accessories compatible with it rather than now seeing all accessories for all of the various Bluetti systems.
Thank you.
(Review from www.bluettipower.com)
Maybe a slightly faster and any response once damaged products have been returned for replacement updates.
(Review from www.bluettipower.com)
This system is perfect for versatile applications such as home backup for unexpected electrical grid outages and for powering all your needs for off the grid with 50A @ 240v output and expandable to fit almost any needs. Can’t wait to integrate this with fixed solar arrays on the house!
(Review from www.bluettipower.com)
I now have two B500K's for my Apex 300. They both work great.... Best items I ever bought.
(Review from www.bluettipower.com)
I Got the Apex300 Back in July on the Iniegogo buy. I connected a B300K swapped from my AC300 and it worked Great. Ran A Air Conditioner in my Garage Office all summer and saved big $$$. Now with this B500K I have almost doubled The capacity. So shorter recharge in the middle of the night. The New Battery connectors save so much more space so I can place the stack in a smaller space. This is a great addition for home backup and daily use.
(Review from www.bluettipower.com)
B500k is an amazing new addition to Bluettis expandable battery lineup. You can now nearly DOUBLE your stored KwH from 58kwh to 100.4KwH. You get nearly twice the storage for not even twice the size. I’m at 48KwH now and won’t stop till I’m done! Amazing products, easy to install, awesome warranty!
(Review from www.bluettipower.com)
Free shipping on all orders within the mainland US (Hawaii, Alaska and overseas territories excluded - a freight forwarder is required). Orders ship directly from our brand partners' warehouses across the U.S. Order confirmation is emailed immediately; if an item is unexpectedly backordered we notify you before your card is charged. In-stock items are processed within 1-4 business days (cut-off 4:00 PM EST), transit is 3-6 business days, and tracking is emailed within 24 hours of shipment. Typical delivery is 4-10 business days from purchase. Minimum order value is $69.
You have 30 days from the delivery date to initiate a return (35 days for orders placed Nov 25-30 and Dec 25-31). Items must be unused, in original packaging with tags attached, and returns require prior authorization from our team.
To start a return: +1 (307) 317-7213, hello@ecosolarkits.com, or live chat. Read the full return and refund policy
Frequently bought together
Compatible add-ons for the Bluetti B500K Expansion Battery 5,120Wh.
Bluetti B500K Expansion Battery 5,120Wh$1,999.00
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