When it comes to compact and portable power stations, few options stand out as much as the Anker 521 vs Bluetti AC2A. Both models offer impressive specs, reliability, and versatility for their size, making them ideal for everything from road trips to emergency home use.
In this detailed comparison, we examine both products across critical performance categories to help you decide which compact power station is best suited for your needs.
Contents
Differences Anker 521 vs Bluetti AC2A
Below is a summary of the specifications:
Battery Capacity, Expandability, and Battery Lifespan
The Anker 521 is equipped with a 256Wh LiFePO₄ battery, giving it a slight edge over the Bluetti AC2A, which houses a 204.8Wh LFP battery. Both models use lithium iron phosphate chemistry, offering excellent thermal stability and safety, along with a lifespan of over 3,000 cycles to 80% capacity.
Neither power station supports expandable capacity, meaning what you see is what you get in terms of energy storage. However, for such compact units, this is standard.
Winner: Anker 521
Thanks to its higher battery capacity, the Anker 521 offers more runtime, making it a more reliable choice for users needing extended usage between charges.
Power Output and Device Compatibility
The Anker 521 delivers 200W of continuous AC power with a 450W surge, making it suitable for charging phones, laptops, CPAP machines, and small appliances. It includes 1 USB-C (60W), 2 USB-A (12W), and a 12V car port.
The Bluetti AC2A, on the other hand, steps it up with 300W AC output and a 600W surge rating, allowing it to handle more power-hungry devices. It also offers a 100W USB-C port, two 15W USB-A ports, and the same 12V car port.
Winner: Bluetti AC2A
With higher AC output and a more powerful USB-C port, the AC2A is better suited for running a wider range of devices.
Charging Speed and Solar Input
Charging speed is one of the most vital features for any portable power station. The Anker 521 supports 65W AC input, requiring around 2.5 hours to reach 80%, while its solar input is also capped at 65W, limiting its off-grid charging potential.
The Bluetti AC2A shines in this department with its 270W Turbo Charging, recharging from 0–100% in just 70 minutes. It also allows solar input up to 200W, greatly enhancing flexibility for outdoor recharging.
Winner: Bluetti AC2A
Whether you’re recharging from the wall or the sun, the AC2A offers faster and more efficient options.
Ports and Output Variety
In terms of connectivity options, the Anker 521 provides one USB-C (60W), two USB-A ports (12W each), one 12V/10A car socket, and one AC outlet.
The Bluetti AC2A improves on this by offering a 100W USB-C port, two USB-A ports (15W each), a 12V/10A car port, and two AC outlets. This makes it more versatile for running multiple devices at once and charging modern electronics like MacBooks or drones.
Winner: Bluetti AC2A
More AC outlets and a stronger USB-C port make it better for multitasking and modern device support.
Portability and Weight
Weighing in at just 7.9 lbs, the Bluetti AC2A is lighter than the Anker 521, which weighs 9.57 lbs. While both are compact and easily portable, the AC2A has a smaller footprint and slightly more ergonomic design for quick transport.
Winner: Bluetti AC2A
Its lighter weight and compact build make it the more convenient choice for on-the-go users.
Connectivity and Smart Features
The Anker 521 lacks app integration or Bluetooth/Wi-Fi features, meaning all monitoring and usage have to be done manually.
In contrast, the Bluetti AC2A includes Bluetooth connectivity via the Bluetti App, allowing users to control power modes, monitor battery status, and adjust output remotely through their smartphone.
Winner: Bluetti AC2A
Smart app control gives it a significant edge in usability and convenience.
Quick Rundown Of Anker 521
Quick Rundown Of Bluetti AC2A
Conclusion
Both the Anker 521 and Bluetti AC2A are well-engineered compact power stations, but they serve slightly different priorities. The Anker 521 is a solid option for users who value battery lifespan, build quality, and slightly more energy storage.
However, the Bluetti AC2A stands out in almost every practical category — from power output and charging speed to smart connectivity and portability. It’s a more modern and versatile power solution for users who demand faster, smarter, and more flexible portable power.
Overall Winner: Bluetti AC2A
With better power delivery, faster recharge times, and Bluetooth app control, the Bluetti AC2A is the superior choice for anyone looking to maximize performance in a compact form.