EcoFlow RIVER 2 Max vs Yoshino B660 SST
What is the difference?
The EcoFlow RIVER 2 Max has 500 W of power, 1 kW peak, a 512 Wh battery. The Yoshino B660 SST has 660 W of power, a 602 Wh battery.
The EcoFlow RIVER 2 Max uses a LiFePO4 battery, the Yoshino B660 SST a lithium-ion (NMC) one. LiFePO4 generally lasts more charge cycles, so the EcoFlow RIVER 2 Max should last longer.
The EcoFlow RIVER 2 Max is rated for 3000 cycles, the Yoshino B660 SST is rated for 4000 cycles.
The EcoFlow RIVER 2 Max weighs 13 lb, the Yoshino B660 SST weighs 17 lb. The EcoFlow RIVER 2 Max is easier to carry.
Both have a 5-year warranty.
Specs side by side
| EcoFlow RIVER 2 Max | Yoshino B660 SST | |
|---|---|---|
| Capacity (Wh) | 512 | 602 |
| Continuous (W) | 500 | 660 |
| Peak (W) | 1000 | — |
| Solar input (W) | 220 | — |
| Chemistry | LiFePO4 | NMC |
| Cycles | 3000 | 4000 |
| Expandable | — | — |
| Weight (lb) | 13 | 17 |
| Warranty (yr) | 5 | 5 |
| Fridge run time | 9.7 h | 11.4 h |
| CPAP run time | 11.6 h | 13.6 h |
| Wi-Fi router run time | 33.8 h | 39.7 h |
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Specs as read from manufacturer pages on 2026-10-31 / 2026-10-31. Specs one maker does not list are left out of the comparison. Run times are for that appliance alone with a typical duty cycle, after inverter and depth-of-discharge losses. Sponsored links; we may earn a commission.
Common questions
Which has more capacity, EcoFlow RIVER 2 Max or Yoshino B660 SST?
The Yoshino B660 SST. More capacity: 602 Wh vs 512 Wh.
Which is lighter, EcoFlow RIVER 2 Max or Yoshino B660 SST?
The EcoFlow RIVER 2 Max. Lighter: 13 lb vs 17 lb.
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Compare other models → · All EcoFlow models · All Yoshino models