BLUETTI B500K Expansion Battery 5.12 kWh

The BLUETTI B500K is a powerful LiFePO4 expansion battery for users who want to scale up their existing BLUETTI energy system with additional storage capacity. With 5,120 Wh per module, this is a serious battery expansion for emergency power, home backup, off-grid applications, mobile workspaces, and longer autonomy in a camper or service van.

This battery module is designed for compatible BLUETTI platforms such as the AC300, AC500, AC200L, AC200MAX, and Apex 300. That makes the B500K especially interesting for users who already work with BLUETTI and do not want to switch to a completely new system, but simply want to add more capacity in a targeted way.

The combination of 5.12 kWh storage, LiFePO4 battery chemistry, 4,000+ charge cycles, and modular expandability makes the BLUETTI B500K an attractive choice for users who value reliability, scalability, and long-term usability.

5.12 kWh storage

Add 5,120 Wh of extra battery capacity to a compatible BLUETTI system in one step.

LiFePO4 chemistry

Durable battery cells with a long lifespan and high safety for intensive use.

4,000+ cycles

Suitable for long-term use while maintaining battery performance up to 80% remaining capacity.

Modular expansion

Ideal for users who want to grow their existing BLUETTI system step by step.

Overview of key benefits

• 5,120 Wh of extra storage capacity per battery module
• LiFePO4 battery cells for long lifespan and stable performance
• 4,000+ charge cycles to 80% remaining capacity
• Compatible with AC300, AC500, AC200L, AC200MAX, and Apex 300
• Suitable for emergency power, home backup, off-grid, and mobile use
• Modular scalability within multiple BLUETTI configurations
• Monitoring and updates via the connected BLUETTI system and app
• Highly attractive for users who want to increase autonomy without switching to a new platform

Detailed product explanation

The BLUETTI B500K is designed for users who notice that their existing BLUETTI system is technically powerful enough, but in practice does not offer enough battery reserve. Think of situations where you want to keep essential devices running longer during a power outage, or where you need to bridge multiple days off-grid without recharging immediately.

With 5.12 kWh per module, you instantly add a substantial energy reserve. That makes the B500K attractive for larger home backup systems, modular mobile installations, and expandable solutions where flexibility matters more than a fixed all-in-one setup.

Precisely because BLUETTI supports various ecosystem components, the B500K fits well with users who want to expand their system even further later on.

How the product works

The BLUETTI B500K is connected to a compatible main unit or ecosystem setup. The main unit then manages charging, discharging, battery management, and communication within the system. In other words, the battery works as an external storage module that increases the total capacity of the installation.

Depending on the platform, different cables are used. A different connection is required for AC300 and AC200L than for AC500. Specific combinations are also possible within Apex 300 setups. That is why it is important to choose the correct version and cabling in advance.

Battery status and system information can be monitored through the connected BLUETTI main unit and the BLUETTI app.

Who is this product suitable for?

• Users of a BLUETTI AC300, AC500, AC200L, AC200MAX, or Apex 300
• Households looking for longer emergency power runtime or additional battery reserve
• Business users who need modular mobile power storage
• Campers, service vans, and off-grid projects where scalability matters
• Users who want to expand further within the same ecosystem later on

When is the B500K less suitable?

The BLUETTI B500K is less suitable if you are looking for a fully standalone power station with built-in AC outlets. It is also not designed for unprotected outdoor placement, because according to the reviewed specifications the enclosure is rated IP20.

This battery performs best in a dry, sheltered environment as part of a compatible BLUETTI system.

Practical benefits in daily use

In practice, the B500K is mainly about extra peace of mind and flexibility. You expand the energy reserve of your existing system without needing to buy a completely new platform. That makes upgrading more straightforward and often more efficient.

For users who want to keep running longer during power outages, or for mobile applications where extended autonomy is crucial, the B500K provides an immediate and noticeable benefit.

It is also attractive in larger setups, because you can expand step by step instead of having to invest in everything at once.

Monitoring, app, and system management

The B500K is managed through the connected BLUETTI system. That allows you to monitor battery status, system information, and in many cases firmware management through the BLUETTI app and the main unit the battery is connected to.

That is practical for users who want to manage their energy storage clearly within one ecosystem, without separate platforms or external monitoring solutions.

Why choose Off Grid Supply?

Off Grid Supply looks beyond the battery module itself and focuses on the full configuration. That helps prevent wrong cable choices, illogical combinations, or a system that seems to fit on paper but is not optimal in practice.

We help you think about compatibility, scalability, practical use, expandability, and the right combination with systems such as the BLUETTI AC300 or AC500.

Relevant internal and external links

View all BLUETTI power stations

BLUETTI AC500 power station

BLUETTI AC300 power station

Official BLUETTI B500K product page