BLUETTI · Batteries
BLUETTI B500K Expansion Battery (5120 Wh)
Works with
Apex 300 / AC200L / AC300 / AC500
BLUETTI B500K Expansion Battery (5120 Wh): compare specifications and model compatibility. View expansion battery details, photos and support information at 326energy.
Use
What it adds
The BLUETTI B500K Expansion Battery packs 5,120 Wh (5.12 kWh) of high-density LiFePO4 storage into a single stackable module, allowing you to scale a BLUETTI Apex 300, AC200L, AC300, or AC500 to multi-day whole-home capacity with half as many battery boxes.
Using 4,000-cycle automotive-grade LFP cells in the same footprint width and depth as the B300K, the B500K stacks seamlessly into single- or split-phase BLUETTI home backup towers.
Compatibility
Product details
- Brand
- BLUETTI
- Category
- Batteries
- Compatible with
- Apex 300 / AC200L / AC300 / AC500
- Weight
- 99.2 lb / 45 kg
- Dimensions
- 20.7 × 12.9 × 14.1 in (525 × 327 × 358 mm)
- Model
- B500K2-BBYUS (B500K)
- Capacity
- 5,120 Wh (51.2V, 100Ah)
- Cell chemistry
- LiFePO4 (LFP)
- Cycle life
- 4,000+ cycles to 80% capacity
- Compatible stations
- Apex 300, AC200L, AC300, AC500
- Charge temperature
- 0°C to 40°C (32°F to 104°F)
- Discharge temperature
- -20°C to 40°C (-4°F to 104°F)
In action
Reference setups & real-world use
High-Density 5.12 kWh Utility Room Rack
Single 5,120 Wh LFP module stacks beneath BLUETTI Apex 300, AC200L, AC300, or AC500 to deliver multi-day residential backup in half the modules.
Whole-Home Subpanel & Freezer Backup
Dual B500K modules on a rolling frame provide over 10 kWh of 4,000-cycle LiFePO4 storage for garage freezers and home breaker panels.
Highlights
Why it's worth it
- Massive 5,120 Wh (51.2V, 100Ah) LiFePO4 capacity in a single expansion module
- Compatible with BLUETTI Apex 300, AC200L, AC300, and AC500 modular power systems
- Rated for 4,000+ charge cycles to 80% capacity for long-term off-grid and residential backup
- Shares the 20.7 × 12.9 in footprint of the B300K so mixed stacks align cleanly
- Pairs with the Hub A1 Parallel Box and two Apex 300 stations for high-capacity 240V home systems
In the box
What's included
- BLUETTI B500K Expansion Battery (5,120 Wh)
- Battery Expansion Cable
- User Manual
Keep browsing
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Works with: Apex 300 / AC200L / AC200MAX / AC300 / AC500
Current-generation 2,764.8 Wh LiFePO4 expansion battery rated for 4,000+ cycles to 80% capacity. Compatible with Apex 300, AC200L, AC200MAX, AC300, and AC500; includes front USB-A port and P090A expansion cable.