Bluetti Expansion Battery lets you increase usable storage on your existing Bluetti setup without upgrading the main unit. Designed specifically for systems like AC300, AC500, and Bluetti EP series, these expansion batteries connect directly and scale runtime in a predictable, plug-and-play way.
Instead of investing in a larger station, many U.S. homeowners and RV owners expand only when usage grows — adding storage exactly where it’s needed.
B300 (2,764Wh) — adds up to 24 hours of refrigerator runtime* and keeps Wi-Fi, LED lighting, and device charging running through an overnight outage.
B300S (3,072Wh) — extends solar-powered operation and supports networking equipment, lighting, and small electronics in colder environments where battery performance typically drops.
B500 (4,960Wh) — supports multi-day operation of essential household circuits, including refrigeration, lighting, routers, and medical or monitoring devices, and scales into whole-home backup systems.
Runtime based on a ~700W refrigerator cycling at 30–50% duty; actual results vary by load profile, temperature, and system configuration.
Seamless Compatibility — voltage, charging profiles, and connectors are engineered to match supported Bluetti systems
LiFePO₄ Safety & Longevity — high cycle life and thermal stability for long-term ownership
Modular Growth — add capacity gradually as backup needs, travel frequency, or solar input increases
Trusted by Bluetti owners across the U.S., expansion batteries are a proven way to extend coverage during longer outages, off-grid stays, or seasonal RV use — without unnecessary complexity.
Whether you’re preparing for extended grid outages, storing more solar energy at a cabin, or increasing reserve capacity for mobile use, Bluetti Expansion Battery gives you flexibility without overbuilding your system.
Choose the expansion battery that matches your system and add more runtime today with free U.S. shipping.
