BLUETTI · Batteries
BLUETTI B300K Expansion Battery (2765 Wh)
$799.99Works 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.
Use
What it adds
The BLUETTI B300K Expansion Battery delivers 2,764.8 Wh of high-density LiFePO4 storage in a streamlined, cost-effective module compatible across BLUETTI's current and flagship ecosystems: Apex 300, AC200L, AC200MAX, AC300, and AC500.
Built with automotive-grade LFP cells inside a rigid aluminum-reinforced frame with wireless internal board architecture and active cooling fans, the B300K stacks cleanly and can even be mixed in the same stack with B300 or B300S batteries.
Compatibility
Product details
- Brand
- BLUETTI
- Category
- Batteries
- Compatible with
- Apex 300 / AC200L / AC200MAX / AC300 / AC500
- Weight
- 65 lb / 29.5 kg
- Dimensions
- 20.7 × 12.9 × 8.2 in (525 × 327 × 209 mm)
- Model
- P-B300K-UN-GY-BL-010 (B300K)
- Capacity
- 2,764.8 Wh (51.2V, 54Ah)
- Cell chemistry
- LiFePO4 (LFP)
- Cycle life
- 4,000+ cycles to 80% capacity
- Compatible stations
- Apex 300, AC200L, AC200MAX, AC300, AC500
- Standalone port
- 1 × USB-A (5V⎓2.4A, 12W)
- 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
Modular Garage Transfer Switch Tower
BLUETTI B300K (2,764.8 Wh) stacks cleanly beneath a BLUETTI AC200L / Apex 300 via the P090A expansion cable for residential backup panels.
Off-Grid Cabin Solar Storage Bank
Dual 4,000-cycle B300K LFP battery modules integrate into daily solar-charged cabin systems and feature a front 12W USB-A port.
Highlights
Why it's worth it
- 2,764.8 Wh (51.2V, 54Ah) LiFePO4 expansion module compatible with Apex 300, AC200L, AC200MAX, AC300, and AC500
- Rated for 4,000+ cycles to 80% capacity — engineered for over a decade of daily solar or backup cycling
- Mix-and-match flexibility: can be daisy-chained alongside B300, B300S, or B500K batteries on supported stations
- Recharges to 80% in ~45 minutes when paired with the AC200L or AC300/AC500 fast-charge inputs
- Built-in 12W USB-A port on the front panel for emergency phone or lantern charging
- Includes the P090A expansion cable (use CA90 right-angle cable for flush Apex 300 stacking or P090D→P150D for AC500)
In the box
What's included
- BLUETTI B300K Expansion Battery (2,764.8 Wh)
- P090A Battery Expansion Cable (80 cm)
- User Manual
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