The B80 Expansion Battery packs quite a punch for its compact size. Beyond simply expanding the AC60's capacity, it doubles as a standalone DC power source — a versatile feature that sets it apart. With a 100W USB-C port, an 18W USB-A port, and a 12V/10A cigarette lighter output, it can charge smartphones, tablets, and even run a mini-fridge. This flexibility means you can tap into the main power station for large loads while dedicating the B80 to smaller peripheral devices elsewhere.
Price Point: At the time of this review, the Bluetti B80 carried a street price of $399 — a competitive entry point for LiFePO4 expansion storage.
Bluetti B80 Specifications
| Specification | Details |
|---|---|
| Battery Capacity | 806Wh |
| Cell Type | LiFePO4 |
| DC Input Interface | DC7909, 200W/8A MAX, 12V–28VDC |
| USB-A | 5VDC/3A, 9VDC/2A, 12VDC/1.5A |
| USB-C (Type-C) | 5/9/12/15/20VDC, 3A, 30VDC, 5A (Built-in eMarker chip) |
| Cigarette Lighter Port | 12VDC/10A |
| Expansion Port Voltage | 17.5V–55.2VDC, 30A Max |
| Power Bank Output | 15.2VDC, 200W Max |
| Dimensions (L×W×H) | 11.42 × 8.19 × 6.0 in |
| Working Humidity | 10%–90% |
| Storage Temperature | -22°C–40°C / -4°F–104°F |
| Charging Temperature | 0°C–40°C / 32°F–104°F |
| Discharging Temperature | -22°C–40°C / -4°F–104°F |
| Weight | 21.83 lbs |
Build and Design
Simplicity is the name of the game with the B80. The front panel features just two buttons — one for power and one for managing the DC output and cigarette lighter port along with USB connections. Five LED indicators show remaining charge at a glance, giving you a quick and clear picture of how much juice is left. A digital display might have been a nice premium touch, but Bluetti clearly opted to keep things lean and cost-effective. For what this unit is designed to do, the minimalist approach works well.
Durability is another strong suit. The B80 carries an IP65 water-resistant and dustproof rating, meaning light rain and dusty job sites won't be an issue. This rugged construction ensures the battery stays operational regardless of how harsh the environment gets — a critical feature for anyone who relies on portable power outdoors.
Usage and Power Capacity
When tested with the Bluetti AC60 Power Station, actual battery capacity measured out using a 350W AC load at 240Wh — solid performance for smaller power loads and proof that the expansion system can handle real-world demands. The rated capacity of the B80 expansion battery alone sits at 806Wh.
Pairing the AC60 with the B80 through the same power test yielded a total discharge capacity of roughly 1,030Wh. After subtracting the main station's usable capacity of 600Wh from the B80, the total AC60+B80 combination needed about 1,429Wh to go from completely empty to fully charged. When you account for AC-side losses, the B80's actual recharge value sits around 949Wh.
One limitation worth noting: the AC60's charge rate tops out at 600W, which is respectable for an integrated battery. However, larger setups with 1kWh-class batteries tend to see charge speeds creep beyond 1,000W. Stacking additional B80 expansion units on the AC60 platform will extend total charge times — something to factor in if rapid turnaround matters to you.
Final Verdict
The Bluetti B80 Expansion Battery is a worthwhile companion for the AC60 Portable Power Station. It allows you to scale your energy reserves up or down depending on the situation at hand. In testing, the B80 paired with the AC60 pushed total usable capacity to around 1,030Wh — comparable to some standalone units that cost considerably more and weigh twice as much.
An especially practical detail is that the B80 functions on its own as a DC power source. If all you need is a beefy USB-C battery pack without the overhead of an AC inverter, the B80 fills that role admirably. Overall, it's a versatile, compact system — particularly attractive if you don't always need the full capacity but want it available when conditions demand it.