BLUETTI B300K Expansion Battery for Apex 300 - 2,764.8Wh

Name: BLUETTI B300K Expansion Battery for Apex 300 - 2,764.8Wh
Brand: Bluetti
SKU: B300k-APEX300
Price: 1248.99 USD
Availability: InStock

$1,248.99 - $1,248.99

$1,248.99

$1,248.99 - $1,248.99

$1,248.99

+ Free Shipping

#1 Authorized Distributor

We are an authorized distributor for all Bluetti products.

Lowest Price Guarantee

See a cheaper price? Let us know and we'll match it!

No Sales Tax

Enjoy no taxes on all orders.

Free shipping on all orders

Enjoy free domestic shipping. Click here to learn more

Talk to a Real Person

Any questions? Call (855) 434-2703 or message us on our live chat below.

BLUETTI B300K Expansion Battery | Apex 300 Compatible | Scalable Backup Power | LiFePO₄

Reliable, High-Capacity Energy for Apex 300 Systems.

The BLUETTI B300K is a 2,764.8Wh LiFePO₄ expansion battery designed specifically to extend the capacity of your Apex 300 Power Station. Built with automotive-grade cells and over 6,000 life cycles, it delivers safe, long-lasting, and dependable energy for home backup, RV use, or off-grid adventures. Stack or pair multiple B300K units to customize your system and scale your energy solution for any scenario.

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 (2,764.8Wh ): Perfectly complements the Apex 300, extending runtime and keeping your 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 B300K for Apex 300?

Extend Your Runtime: Add 2,764.8Wh to your Apex 300 system for longer power during storms, outages, or off-grid adventures.
Flexible & Scalable: Stack or mix with other B-series batteries to grow your system as your energy needs increase.
Standalone & Integrated Use: Works as an expansion for the Apex 300 or independently powers devices via USB-A ports.
Fast, Safe, and Reliable: Rapid charging, robust safety features, and long-life LiFePO₄ chemistry ensure dependable energy whenever you need it.

What’s Included:

1× BLUETTI B300K Expansion Battery
1 x CA90* Battery Connection Cable
1 x User Manual & Warranty Documentation

Specifications

Category	Specification
Battery Info
Model	B300K
Battery Capacity	2,764.8 Wh (51.2 V, 54 Ah)
Battery Type	LiFePO₄ (Lithium Iron Phosphate)
Cycle Life	6,000+ cycles to 80% capacity
Output
USB-A Port	12 W Max, 5 V / 2.4 A
Capacity	2,764.8 Wh
General
Weight	29.5 kg / 65.04 lbs
Dimensions (L × W × H)	52.5 × 32.7 × 20.9 cm / 20.67 × 12.87 × 8.23 in
Charging Temperature	0 °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 Humidity	5% to 95% RH
Max Charging Current	60 A (may decrease outside specified temps)
Max Discharging Current	70 A
Expansion Ports	2 × Expansion Port, 58.4 VDC Max, 90 A Max
Warranty	3 + 1 Years
Compatibility	AC200L, AC200MAX, AC300, AC500, Apex 300

Shopping Guide

Power Storage & Inverter

Item / Appliance	Typical Power (W)	Usage Time (hrs)	Total Energy Needed (Wh)	Battery Size Needed (Ah) (12V System)	Inverter Size Needed (W)
LED Light Bulb (10W)	10W	5 hrs	50 Wh	4.2 Ah	100W
Phone Charging	5–10W	2 hrs	10–20 Wh	0.8–1.7 Ah	100W
Laptop Charging	50–100W	3 hrs	150–300 Wh	12.5–25 Ah	200W
Ceiling Fan	75W	6 hrs	450 Wh	37.5 Ah	150W
LED TV (32")	60W	4 hrs	240 Wh	20 Ah	150–200W
Refrigerator (Mini)	100W (avg)	8 hrs	800 Wh	66.6 Ah	300–500W
Water Pump (1HP)	750W	1 hr	750 Wh	62.5 Ah	1000W
Microwave Oven	1000W	0.5 hr	500 Wh	41.6 Ah	1200–1500W
Electric Kettle	1500W	0.3 hr	450 Wh	37.5 Ah	2000W

Key Formulas

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

How To Choose The Right Products

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

Why Shop With Us

Why Shop With Ecogrid Supply?

Authorized & Trusted Dealer: We’re fully authorized for every brand we carry, so you get genuine products with full manufacturer warranties.
Fast, Reliable Shipping: All items ship from our U.S. warehouses with quick and dependable freight options to keep your project on track.
30-Day Hassle-Free Returns: Change your mind? No worries — 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 real people who know off-grid power systems.
Expert Energy Guidance: Our solar and backup energy specialists are ready to help you with design, planning, product questions, and installation tips.
USA-Based Service: Our team proudly operates here in the United States, providing local, knowledgeable, and friendly support.
Secure Payments: Shop confidently with our encrypted, secure checkout to protect your personal and payment information.
Built for Energy Independence: Whether you’re powering a cabin, prepping for emergencies, or going off-grid, our products are selected for performance, reliability, and sustainable operation.