BLUETTI BlueCell 300 (B300K) — 2764Wh Expansion Battery

BLUETTI BlueCell 300 (B300K) — 2,764.8Wh Expansion Battery

The B300K is BLUETTI's versatile LiFePO4 expansion battery — designed to grow your power system as your needs evolve. With 2,764.8Wh of storage per module and 4,000+ life cycles, it's built to deliver years of reliable runtime extension. Wall-mountable for RV or home installations with efficient heat dissipation, the B300K seamlessly connects to BLUETTI's portable and home backup power stations including the Apex 300, AC200MAX, AC200PL, AC300, and AC500 systems.

Key Specs

• Capacity: 2,764.8Wh
• Battery Type: LiFePO4 (Lithium Iron Phosphate) — Prismatic cells, lighter weight
• Life Cycles: 4,000+ cycles to 80% original capacity
• Shelf-Life: Recharge to 80% every 3-6 months
• USB-A Port: 1× 5V/2.4A, 12W (for powering DC devices — pair with a power station for AC)
• Charging Current: 60A Max
• Weight: 65.04 lbs (29.5 kg) — lighter than most expansion batteries in its class
• Dimensions: 20.67 × 12.87 × 8.23 in (52.5 × 32.7 × 20 cm)
• Charging Temperature: 32°F to 104°F
• Operating Temperature: -4°F to 104°F
• Working Humidity: 5% to 95% RH
• Mounting: Wall-mount compatible for RV or home installations
• Warranty: 4 years

What It Can Power (per module)

• Mini Fridge (150W) — 13.6 hours
• Oven (1,500W) — 1.5 hours
• Washing Machine (800W) — 2.7 hours
• Electric Heater (700W) — 3.1 hours
• Water Pump (1,200W) — 1.8 hours
• Coffee Machine (550W) — 4 hours
• Electric Saw (750W) — 2.9 hours
• Smartphone (15Wh) — 82 charges

System Combinations

• With AC200MAX (1-1.5 Days): up to 7,577.6Wh
• With AC200PL (1-1.5 Days): up to 7,833.6Wh
• With AC300 Split-phase System (2 Days): up to 22,118.4Wh
• With AC500 Split-phase System (3 Days): up to 33,177.6Wh
• With Apex 300 (stack up to 6 modules): up to 19.36kWh + 2,764.8Wh base

Pairs Well With

• BLUETTI Apex 300 — 3,840W Portable Power Station — primary host unit, stack up to 6 B300K modules
• BLUETTI Apex 300 Trolley — wheeled cart for transporting stacked units
• BLUETTI Sora 220 Solar Panel — solar charging to keep expanded banks topped up
• BLUETTI PV100FX Dual 100W Solar Kit — 200W folding solar input

Not sure what size you need? Use our free Power Station Size Calculator to get a personalized recommendation in under 2 minutes — factors in real-world appliance duty cycles so you don't undersize.

Warranty & Support

BLUETTI 5-year manufacturer warranty (2-year on accessory items like ePad). TrailVault is an authorized BLUETTI dealer — full warranty support, genuine products, and direct human contact at joel@trailvault.co.