EcoFlow RIVER 2 ProvsYoshino B660 SST
Head-to-head comparison of scores, specs, and features.
VS
Winner
EcoFlow RIVER 2 Pro
82.8Grade B+
Price
$599.00
AC Power
800W
Yoshino B660 SST
72.2Grade B
Price
$549.00
AC Power
660W
EcoFlow RIVER 2 Prowins by10.69points overall.
The Verdict
Overall take
Buy EcoFlow RIVER 2 Pro if
- Better Expandable Capacity: Yes vs No
- Better Energy Density Wh Per Kg: 93.0 vs 35.6
- Better Weight: 8.26 vs 16.9
Buy Yoshino B660 SST if
- Better Battery Lifespan Cycles: 4000 vs 3000
- Better Ups Switch Time: 20ms vs 30
- Consider for different needs
Top 3 Key Differences
Expandable Capacity
Yesvs No
Score: 100 vs 0
Energy Density Wh Per Kg
93.0vs 35.6
Score: 90 vs 30
Battery Lifespan Cycles
3000vs 4000
Score: 77.5 vs 100
Performance by Category
ChargingTie
EcoFlow RIVER 2 Pro
85.6
Yoshino B660 SST
85.0
AC PowerEcoFlow RIVER 2 Pro wins
EcoFlow RIVER 2 Pro
66.7
Yoshino B660 SST
59.7
ConnectivityTie
EcoFlow RIVER 2 Pro
75.0
Yoshino B660 SST
75.0
PriceTie
EcoFlow RIVER 2 Pro
84.7
Yoshino B660 SST
82.7
BatteryEcoFlow RIVER 2 Pro wins
EcoFlow RIVER 2 Pro
71.0
Yoshino B660 SST
42.0
PhysicalEcoFlow RIVER 2 Pro wins
EcoFlow RIVER 2 Pro
96.7
Yoshino B660 SST
70.9
Advanced FeaturesYoshino B660 SST wins
EcoFlow RIVER 2 Pro
54.8
Yoshino B660 SST
58.9
WarrantyTie
EcoFlow RIVER 2 Pro
100.0
Yoshino B660 SST
100.0
Full Technical Specifications
| Feature | EcoFlow RIVER 2 Pro | Yoshino B660 SST |
|---|---|---|
Charging | ||
| Ac Charge Speed | 70 | 120 |
| Charger Type | AC wall charger (included), 100-120V~50Hz/60Hz, 940W Max input | AC adapter (DC In), Car (12V), Solar (XT60/MC4), USB-C PD |
| Fast Charging | Yes | Yes |
| Max Solar Input | 220 | 100 |
| Max Solar Panels | 2 | 1 |
| Pass Through Charging | Yes | Yes |
| Smart Charging | Yes | Yes |
| Solar Connector Type | XT60i | MC4 to XT60 (XT60 port) |
| Solar Panel Compatibility | EcoFlow 110W, 160W, 220W Bifacial solar panels; third-party panels via MC4-to-XT60i adapter (11-50V, 13A, 220W max) | Yoshino SP100 (12-30VDC) |
AC Power | ||
| Ac Output Amps | 6.67A max (800W / 120V) | 3 outlets, 120VAC, 60Hz (pure sine wave) |
| Ac Power Continuous | 800 | 660 |
| Ac Power Surge | 1600 | 900 |
| Ac Wave Quality | Pure Sine Wave | Pure Sine Wave |
Connectivity | ||
| App Control | Yes | Yes |
| Bluetooth | Yes | Yes |
| Wifi Connectivity | Yes | Yes |
| Wireless Charging | No | No |
Price | ||
| Base Price | 599.00 | 549.00 |
| Bundle Price | $379.00 | — |
| Cost Per Wh | 0.78 | 0.91 |
| Price Description | On sale $339.00 (regular $599.00) as of 2026-04-09. Flash sale pricing — regular price is $599. | Sale $549 (reg. $699) |
Battery | ||
| Battery Capacity Wh | 768 | 602 |
| Battery Lifespan Cycles | 3000 | 4000 |
| Expandable Capacity | Yes | No |
| Extra Battery Capacity | 768 | — |
| Max Extra Batteries | 1 | 0 |
Product Info | ||
| Brand | EcoFlow | Yoshino |
| Model Name | RIVER 2 Pro | B660 SST |
| Product Url | https://us.ecoflow.com/products/river-2-pro-portable-power-station | https://yoshinopower.com/products/b660-solid-state-portable-power-station |
DC Power | ||
| Dc Output | 12.6V, 10A/3A/3A, 126W Max (DC Out), 12.6V, 3A, 36W Max (DC5521 Output) | 12V DC: 2 ports 12.6VDC/10A (126W total); USB-C: 20W; USB-C PD: 100W; USB-A: 2 ports 12W each |
Physical | ||
| Dimensions | 27 x 26 x 22.6 cm | 29.7 x 20.3 x 25.4 cm |
| Energy Density Wh Per Kg | 93.0 | 35.6 |
| Noise Level | 62 | 38 dB |
| Operating Temp | 14°F to 113°F | Discharge: 14 to 140F (-10 to 60C); Charge: 32 to 131F (0 to 55C) |
| Portable | Yes | Yes |
| Weight | 8.3 kg · 18.2 lbs | 16.9 kg · 37.3 lbs |
Advanced Features | ||
| Parallel Expansion | No | No |
| Ups Functionality | Yes | Yes |
| Ups Switch Time | 30 | 20ms |
Warranty | ||
| Warranty | 5 | 5 |