BLUETTI B300K Expansion Battery | 2.7kWh LFP Capacity
Extend Your Power, Wherever You Are
The BLUETTI B300K is a dependable 2.7kWh LiFePO₄ expansion battery built to increase the runtime of your BLUETTI power station. Whether you’re keeping a home office running during outages, powering a camper van along Ireland’s coast, or adding extra storage for tools and equipment, the B300K gives you more capacity without changing your existing setup.
Simple, Scalable Energy Storage
Designed around long-life LFP technology, the B300K connects directly to your Apex 300, AC300, AC500, AC200MAX or AC200L using the official expansion cables. Once paired, your system can scale from a single battery to a multi-module bank capable of supporting serious home backup, off-grid living or mobile work.
Fast Charging & Easy Operation
LED indicators keep things simple, the USB-A port provides an easy top-up for small devices, and when paired with an AC300 or AC500, the B300K can recharge from 5% to 80% in around 45 minutes under recommended temperatures. It’s a practical, reliable upgrade for Irish homes, vans, workshops and off-grid setups.
- 2,764.8Wh LFP Battery: Long lifespan, stable and safe daily performance
- Fast Charging: With AC300/AC500, approx. 45 minutes (5% → 80%)
- USB-A Output (12W): Ideal for phones and small devices
- Dual Expansion Ports: Supports multi-battery setups
- Clear LED Indicators: Quick view of battery status
- Pass-Through Capable: When connected to a power station
- Rugged and Durable: Built for Ireland’s mix of home and mobile use
Important Note
The B300K is an expansion battery and is not designed to operate as a standalone unit. It must be connected to a compatible BLUETTI power station.
Compatible Power Stations
The B300K works with the following BLUETTI models:
| Power Station | Max B300K (or mix) |
| Apex 300 | Up to 6 |
| AC300 | Up to 4 |
| AC500 | Up to 6 |
| AC200MAX | Up to 2 |
| AC200L | Up to 2 |
What’s in the box: 1.Bluetti Apex 300 B300K Expansion Battery, 2. P090A Battery Expansion Cable ( 31.49in / 800mm ), 3. User Manual & Warranty Card.
| Product | Bluetti Apex 300 B300K Expansion Battery |
| Size | 52.5 (L) x 32.7 (W) x 20.9 (H) cm |
| Weight | 29.5 kg |
| Battery Type | LFP (LiFePO4 battery) |
| Battery Cycles | 4000 cycles to 80%+ capacity |
| Battery Capacity in Wh | 2764 Wh |
| Output USB | USB-A Output (x1): 12W Max, 5V/2.4A |
| Output Port | Expansion Port (x2): 58.4VDC Max, 90A Max. |
| Charging Temperature | 0°C to 40°C (32°F to 104°F) |
| Discharging Temperature | -20°C to 40°C (-4°F to 104°F) |
| Charging Current | 60A Max. (Current may decrease outside specified temperatures) |
| Shelf Life | For long-term storage over 6 months, charge to 40%-60% SoC.
Fully cycle every 3 months. |
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