BLUETTI B300K Expansion Battery

What extra runtime does it give you?

The B300K adds 2,764.8Wh to a compatible BLUETTI power station. Paired with the two units we stock:

• BLUETTI AC200PL: total capacity rises from 2,304Wh to 5,068.8Wh on the same 2,400W output. A full-size fridge (~150W) runs for ~29 hours instead of ~13 (+16 hours); a camping fridge (~60W) runs for ~72 hours instead of ~33 (+39 hours)
• BLUETTI Apex 300: total capacity rises from 2,764.8Wh to 5,529.6Wh on the same 3,840W output. A full-size fridge runs for ~31 hours instead of ~16 (+15 hours); an induction cooktop (~2000W) runs for ~2 hours 20 minutes instead of ~1 hour 10 minutes (+1 hour 10 minutes)

It's also usable on its own — a built-in 12W USB-A port lets you charge small devices directly off the pack without a host station connected.

Figures are estimates based on typical appliance draw and around 15% inverter loss — actual runtime varies with the appliance, ambient temperature and load.

The BLUETTI B300K is the expansion battery that turns a single power station into a genuine home energy system. Matching its host unit's chemistry and voltage, it adds a further 2,764.8Wh of LiFePO4 storage — built on the same 6,000+ cycle cells you'd expect from BLUETTI's larger stations — so you can scale capacity up as your off-grid or backup power needs grow, rather than buying a second standalone unit.

It's designed to link directly into compatible BLUETTI systems via a dedicated expansion port, supporting up to 60A charge and 70A discharge current for fast, efficient energy transfer between units. It's a substantial unit at 29.5kg, best moved with two hands, but that mass is all battery. A single USB-A output is included for convenience charging directly off the pack.

• 2,764.8Wh LiFePO4 capacity (51.2V, 54Ah), 6,000+ cycles to 80% retention
• Compatible with Apex 300, AC200L, AC200PL, AC300 and AC500 (plus existing B300/B300S setups)
• Connects via dedicated expansion port: 60A max charge, 70A max discharge
• Dual 58.4V DC expansion ports rated to 90A max each
• Built-in 12W USB-A output (5V/2.4A) for direct device charging
• Operating range: 0–40°C charging, -20–40°C discharging
• Weight 29.5kg, dimensions 525 × 327 × 209mm
• 4-year manufacturer warranty, Australian stock and support