BLUETTI · Batteries
BLUETTI B500K Expansion Battery (5120 Wh)
$1,389.99Works with
Apex 300 / AC200L / AC300 / AC500
High-density 5,120 Wh (51.2V, 100Ah) LiFePO4 expansion module rated for 4,000+ cycles to 80% capacity. Scales Apex 300, AC200L, AC300, and AC500 systems for multi-day home backup with an included expansion cable.
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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