Description
BLUETTI B500K Expansion Battery (for Apex 300) | 5,120Wh
Weight: 99.2lbs
Dimensions: 20.47 × 12.87 × 12.15 in
Expand your energy system with the BLUETTI B500K Expansion Battery, a high-capacity LiFePO₄ battery designed to dramatically increase the runtime and scalability of the Apex 300 ecosystem. With 5,120Wh of usable energy and long-life chemistry, the B500K is built for serious backup power, off-grid living, and modular system growth.
Key Technology
-
5,120Wh High-Capacity Storage
Adds a substantial 5.12kWh of energy per unit, allowing longer runtimes for essential loads, appliances, and tools. -
LiFePO₄ Battery Chemistry
Lithium Iron Phosphate cells provide enhanced safety, thermal stability, and a long service life with thousands of charge cycles. -
Modular, Stackable Design
Built to scale—add batteries over time as your power needs grow, without replacing your existing system. -
Intelligent Battery Management System (BMS)
Integrated protections against over-charge, over-discharge, over-current, and temperature extremes help ensure safe, reliable operation.
Best Uses
-
Home Backup Power
Extend backup duration during outages when paired with the Apex 300. -
Off-Grid & Remote Power
Ideal for cabins, workshops, and remote properties that need reliable, expandable energy storage. -
RV, Van, and Mobile Power Systems
Increase capacity for extended stays off-grid without running generators. -
System Expansion Over Time
Perfect for users who want to start with a core power station and add storage as energy demands increase.
Compatibility
The B500K Expansion Battery is designed specifically for use within the BLUETTI ecosystem and is optimized for:
-
Apex 300 (primary host system)
-
Compatible BLUETTI expansion architecture and connection cables
Note: Expansion batteries do not operate independently and must be connected to a compatible BLUETTI power station.
Warranty
-
Manufacturer Warranty: 4 years
-
Backed by BLUETTI’s long-term support and service network for peace of mind on large energy investments.
Product Specifications
| Specification | Details |
|---|---|
| Model | BLUETTI B500K |
| Battery Capacity | 5,120Wh (5.12kWh) |
| Battery Chemistry | Lithium Iron Phosphate (LiFePO₄) |
| Cycle Life | 4,000+ cycles to 80% capacity |
| System Type | Expansion battery (not standalone) |
| Compatibility | BLUETTI Apex 300 |
| Scalability | Supports multi-battery configurations |
| Battery Management | Integrated BMS protection |
| Warranty | 4 years |
Built to Scale, Built to Last
The BLUETTI B500K Expansion Battery is a future-ready storage solution for users who need more than short-term power. Whether you’re preparing for outages, building an off-grid system, or expanding an existing Apex 300 setup, the B500K delivers dependable capacity and long-term performance without compromise.
What is the difference between the B300K and B500K Expansion Battery?
| Specification | BLUETTI B300K | BLUETTI B500K |
|---|---|---|
| Capacity (Usable) | ~3,072 Wh | ~5,120 Wh |
| Battery Chemistry | LiFePO₄ (Lithium Iron Phosphate) | LiFePO₄ (Lithium Iron Phosphate) |
| Cycle Life | ~4,000+ cycles (to 80% SOH) | ~4,000+ cycles (to 80% SOH) |
| Nominal Voltage | Comparable across both systems | Comparable across both systems |
| Scalability | Supports multi-battery expansion | Supports multi-battery expansion |
| Best For | Moderate energy expansion | Larger energy expansion needs |
| Typical Use Cases | Extended runtimes for essentials | Long runtimes, larger loads, or full backup |
| Compatibility | Apex Series and compatible BLUETTI hosts | Apex Series and compatible BLUETTI hosts |
| Physical Size / Weight | Smaller / lighter than B500K | Larger / heavier (more capacity) |
| Value Proposition | Better entry-level expansion |
Higher capacity per unit (fewer units needed) |
