Anker PowerHouse 521
Score: 72/100
EF ECOFLOW RIVER 2
Score: 78/100Rankings
The EcoFlow RIVER 2 is a compact, lightweight portable power station featuring a 256Wh LiFePO4 battery and ultra-fast 60-minute AC charging. Its primary limitation is the low continuous output of 300W, which prevents it from running high-draw appliances. It is best suited for light travelers and campers needing to charge phones, laptops, and small electronics.
The Anker 521 Portable Power Station is a compact 256 Wh unit featuring durable LiFePO4 batteries with a 3,000+ cycle lifespan and InfiniPower technology. It provides versatile charging options through six ports including AC, USB-C, USB-A, and car outlets, making it suitable for camping or basic emergency backups. It is best suited for users needing basic backups for low-power devices such as phones, laptops, cameras, and drones.
| Attribute | | |
|---|---|---|
256 Whbest | 256 Whbest | |
200 W | 300 Wbest | |
600 Wbest | 600 Wbest | |
65 W | 110 Wbest | |
| ↓ lower better | 7 hours | 1 hoursbest |
3,000 cyclesbest | 3,000 cyclesbest | |
| ↓ lower better | 3.72 kg | 3.49 kgbest |
60 Wbest | 60 Wbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Reliability & Safety(1) | ||
Warranty Length (years) | 2 years | 5 years |
Charging & Input(3) | ||
Solar Input Max Power (W) | 65 W | 110 W |
AC Charging Time (hours) | 7 hours | 1 hours |
MPPT Solar Controller | false | true |
Build & Usability(1) | ||
Weight (kg) | 3.72 kg | 3.49 kg |
Power Output(1) | ||
AC Continuous Power (W) | 200 W | 300 W |
Products in the top-left offer the best value (high score, low price).
Professional reviewers praise the Anker 521 for its compact size, LiFePO4 safety and longevity, and built-in LED light. They highlight its value for charging phones, laptops, air purifiers, and projectors. However, experts consistently note limitations regarding the small inverter capacity and the single USB-C port as drawbacks.
Everyday users appreciate the product's portability and ability to charge multiple devices like phones, laptops, cameras, and drones repeatedly. Common praise includes its utility for running mini fridges and fans during power outages. Recurring complaints focus on limited capacity for high-power use, the single USB-C port, and the inverter not delivering full rated capacity.
Professional reviewers highlight the EcoFlow RIVER 2 as a leader in fast-charging technology, specifically praising its ability to fully recharge in just 60 minutes. Experts emphasize the utility of X-Boost for powering a wide range of consumer electronics and commend the durability of the LiFePO4 battery chemistry.
Everyday users overwhelmingly appreciate the rapid charging speed and portability, often describing the 60-minute recharge as transformative for emergency preparedness. Many users find the lightweight design perfect for camping and travel while successfully powering essential devices like phones and laptops throughout the day.
“Recharges in 60 min during outage-game-changer”
“7.7 lbs, easy carry for camping; powers phone/laptop/fan all day.”
“300W toaster dies quick (<1 hr); not for heavy appliances”
