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BLUETTI 2x B300K Expansion Batteries for Apex 300 - 5,529.6Wh

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2*B300k-APEX300

$2,497.99
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BLUETTI 2× B300K Expansion Batteries (2,764.8Wh Each) | Apex 300 Compatible | Scalable Backup Power | LiFePO₄

Double the backup. Perfect for Apex 300 systems. The BLUETTI 2× B300K bundle delivers a combined 5,529.6Wh of energy to expand the Apex 300 Power Station. Designed specifically for Apex 300 users, each battery provides 2,764.8Wh of high-capacity, automotive-grade LiFePO₄ power with 6,000+ life cycles, ensuring reliable, safe, and long-lasting energy for home backup, RV use, or off-grid adventures. Easily stack or pair these batteries to customize your Apex 300 system, giving you scalable power for partial-home, whole-home, or extended off-grid backup.

Key Features

  • High-Capacity Modular Storage (2×2,764.8Wh = 5,529.6Wh): Perfectly tailored for the Apex 300, these two batteries double your runtime and keep essential devices and appliances powered during outages.
  • Apex 300–Optimized LiFePO₄ Battery Technology: Advanced automotive-grade cells deliver long lifespan, enhanced safety, and thermal stability, ensuring consistent performance over thousands of cycles.
  • Seamless Apex 300 Compatibility: Specifically designed to integrate with the Apex 300, delivering stable communication, fast charging, and reliable system performance.
  • Scalable Energy Expansion: Stack multiple B300K units, or combine with B300 and B300S batteries to scale your Apex 300 system up to 33,177.6Wh, creating a flexible, future-proof energy solution.
  • Fast Charging & Standalone Power: Charge up to 80% in 45 minutes when paired with Apex 300. USB-A port allows independent charging for phones, tablets, or other essential devices.
  • Built to Last & Protect: Features square LiFePO₄ cells, AI-BMS technology, robust aluminum casing, wireless internal components, and an efficient cooling system for long-term reliability and safety.
  • 3+1 Year Warranty: Extended coverage ensures peace of mind for your Apex 300 expansion setup.

Applications

  • Home Backup & Emergency Power with Apex 300
  • RV & Van Life Power Expansion
  • Off-Grid Cabins, Studios, & Outdoor Living
  • Disaster Preparedness & Extended Outages
  • Scalable Modular Energy Systems

Why Choose the BLUETTI 2× B300K for Apex 300?

  • Double the Runtime for Apex 300: Expand your Apex 300 system with a combined 5,529.6Wh, keeping essentials powered longer during storms, outages, or off-grid adventures.
  • Customizable & Scalable: Stack or mix with other B-series batteries for a flexible setup that grows with your energy needs.
  • Standalone & Integrated Use: Works as an expansion for Apex 300 or independently powers devices via USB-A ports.
  • Fast, Safe, and Long-Lasting: Rapid charging, robust safety features, and long-life LiFePO₄ chemistry ensure reliable energy when you need it most.

What’s Included

  • 2 × BLUETTI B300K Expansion Batteries (2,764.8Wh Each)
  • 2 × CA90* Battery Connection Cable
  • 2 × User Manual & Warranty Documentation
  • Optimized for Apex 300 systems. P090D to P150D cable required for AC500 connection (sold separately).

Specifications

Parameter Details
Battery Info
ModelB300K
Battery Capacity2,764.8 Wh (51.2 V, 54 Ah)
Battery TypeLiFePO₄ (Lithium Iron Phosphate)
Cycle Life6,000+ cycles to 80% capacity
Output
Capacity2,764.8 Wh
USB-A Port12 W max, 5 V / 2.4 A
Performance
Max Charging Current60 A (may decrease outside specified temps)
Max Discharging Current70 A
Expansion Ports2 × Expansion Port, 58.4 VDC max, 90 A max
Environmental
Charging Temperature0°C to 40°C (32°F to 104°F)
Discharging Temperature−20°C to 40°C (−4°F to 104°F)
Storage Temperature Up to 1 month: −20°C to 40°C (−4°F to 104°F)
Up to 6 months: −20°C to 25°C (−4°F to 77°F)
Working Humidity5% to 95% RH
General
Weight29.5 kg / 65.04 lbs
Dimensions52.5 × 32.7 × 20.9 cm
20.67 × 12.87 × 8.23 in
CompatibilityAC200L, AC200MAX, AC300, AC500, Apex 300
Warranty3 + 1 Years

Understanding Your Power Needs

Power Calculation Guide

Sizing Metric Formula & Example
Energy Consumption (Wh) Formula: Watts × Hours
Example: 60W × 4 hrs = 240 Wh
Battery Capacity (Ah) Formula: Watt-hours ÷ System Voltage (V)
Example: 240 Wh ÷ 12V = 20 Ah
Inverter Size (W) Formula: Total Watts × 1.25 (safety margin)
Example: 300W × 1.25 = 375W → Use 400W inverter
Total Load Power (W) Formula: Sum of all appliance watts used simultaneously
Example: Light (10W) + Fan (75W) = 85W
Runtime (hrs) of Battery Formula: (Battery Ah × Voltage) ÷ Total Load (W)
Example: (100Ah × 12V) ÷ 240W = 5 hrs

Find Your Power Match

Need / Application System Recommendation
Basic lighting + phone charging Recommended Battery: 50Ah – 100Ah (12V)
Inverter Size: 100W – 200W
Notes: For small backup setups
Home office (laptop, fan, TV) Recommended Battery: 150Ah – 200Ah (12V or 24V)
Inverter Size: 500W – 1000W
Notes: For moderate usage with 4–6 hours of backup
Home backup (fridge, lights) Recommended Battery: 200Ah+ (24V or 48V recommended)
Inverter Size: 1000W – 1500W
Notes: Ideal for longer backups or heavier loads
Business / shop power backup Recommended Battery: 300Ah+ (48V system)
Inverter Size: 2000W – 3000W
Notes: Suitable for commercial setups or extended power outages

Why Shop With Us

  • Authorized & Trusted Dealer: We’re fully authorized for every brand we carry, so you get genuine products backed by full manufacturer warranties.
  • Fast, Reliable Shipping: Shipped from U.S. warehouses with quick, dependable freight options — keeping your project on track.
  • 30-Day Hassle-Free Returns: Changed your mind? Enjoy a simple 30-day return process for peace of mind.
  • Real Human Support, 7 Days a Week: Reach us by phone, email, or live chat — no bots, no overseas call centers, just experts who know off-grid power systems.
  • Expert Energy Guidance: Our solar and backup energy specialists are here to help with system design, product questions, and installation tips.
  • USA-Based Service: Local, knowledgeable, and friendly support right here in the U.S.
  • Secure Payments: Shop confidently with encrypted, secure checkout protecting your personal and payment information.
  • Built for Energy Independence: Whether powering a cabin, prepping for emergencies, or going off-grid, our products are chosen for performance, reliability, and sustainability.

BLUETTI 2x B300K Expansion Batteries for Apex 300 - 5,529.6Wh

$2,497.99