EcoFlow RIVER 2 Pro vs Yoshino B660 SST

What is the difference?

The EcoFlow RIVER 2 Pro has 800 W of power, 1.6 kW peak, a 768 Wh battery. The Yoshino B660 SST has 660 W of power, a 602 Wh battery.

The EcoFlow RIVER 2 Pro uses a LiFePO4 battery, the Yoshino B660 SST a lithium-ion (NMC) one. LiFePO4 generally lasts more charge cycles, so the EcoFlow RIVER 2 Pro should last longer.

The EcoFlow RIVER 2 Pro is rated for 3000 cycles, the Yoshino B660 SST is rated for 4000 cycles.

The EcoFlow RIVER 2 Pro weighs 18 lb, the Yoshino B660 SST weighs 17 lb. The Yoshino B660 SST is easier to carry.

Both have a 5-year warranty.

Specs side by side

	EcoFlow RIVER 2 Pro	Yoshino B660 SST
Capacity (Wh)	768	602
Continuous (W)	800	660
Peak (W)	1600	—
Solar input (W)	220	—
Chemistry	LiFePO4	NMC
Cycles	3000	4000
Expandable	—	—
Weight (lb)	18	17
Warranty (yr)	5	5
Fridge run time	14.5 h	11.4 h
CPAP run time	17.4 h	13.6 h
Wi-Fi router run time	50.7 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 Pro or Yoshino B660 SST?

The EcoFlow RIVER 2 Pro. More capacity: 768 Wh vs 602 Wh.

Which is lighter, EcoFlow RIVER 2 Pro or Yoshino B660 SST?

The Yoshino B660 SST. Lighter: 17 lb vs 18 lb.

More comparisons

Compare other models → · All EcoFlow models · All Yoshino models