EcoFlow RIVER 2 Max 500
#2 in SmallFull review
A 500Wh LiFePO4 station for camping, CPAP and short power outages. A good middle step between the small RIVER models and the DELTA line.
Amazon $308.99 EcoFlow $329$308.99
The EcoFlow RIVER 2 Max 500 is the better portable power station overall, rated 4.0 to 3.6. The EcoFlow RIVER 2 Max 500 leads on AC output, portability and features. The Dabbsson 300E wins on battery life. The Dabbsson 300E costs $109.99 less ($199 vs $308.99).
Dabbsson 300E
#10 in SmallFull review
For campers and travelers who want a light LiFePO4 battery for phones, laptops, lights and a CPAP. Its 300W ceiling and slow wall charging rule out appliances.
Amazon $199 Dabbsson $199$199
Prices were last checked October 20, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the EcoFlow RIVER 2 Max 500 for AC output (500 W continuous AC vs 300 W continuous AC), portability (83 Wh per kg (13.2 lb (6 kg)) vs 70 Wh per kg (9.4 lb (4.3 kg))) and features (100 W USB-C, app vs app).
- Choose the Dabbsson 300E for battery life (Semi-solid-state LiFePO4, 4,000 cycles, 5-year warranty vs LiFePO4, 3,000 cycles).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every small portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | EcoFlow RIVER 2 Max 500 | Dabbsson 300E |
|---|---|---|
| Overall rating | 4.0/5 | 3.6/5 |
| Value 25% | 85 $0.62 per rated Wh | 81 $0.67 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 76 LiFePO4, 3,000 cycles | 100 Semi-solid-state LiFePO4, 4,000 cycles, 5-year warranty |
| AC output 15% | 72 500 W continuous AC | 41 300 W continuous AC |
| Charging speed 10% | 95 0-100% on AC in 1 h | 50 full AC charge time not published (neutral score used) |
| Portability 10% | 70 83 Wh per kg (13.2 lb (6 kg)) | 45 70 Wh per kg (9.4 lb (4.3 kg)) |
| Solar input 5% | 34 220 W max solar input | 30 120 W max solar input |
| Features 5% | 40 100 W USB-C, app | 20 app |
Specifications
| EcoFlow RIVER 2 Max 500 | Dabbsson 300E | |
|---|---|---|
| Battery | ||
| Rated capacity | 499 Wh | 298 Wh |
| Chemistry | LiFePO4 | Semi-solid-state LiFePO4 |
| Cycle life | 3,000 to 80% | 4,000 to 80% |
| Expandable | No | No |
| Output | ||
| AC output | 500 W (1,000 W surge) | 300 W (600 W surge) |
| Boost mode (resistive loads) | 1,000 W | - |
| AC outlets | 4 total | 2 total |
| 120V 15A outlets (NEMA 5-15R) | 2 | 1 |
| 120V 2-prong outlets (NEMA 1-15R) | 2 | 1 |
| AC waveform | - | Pure sine wave |
| USB-C ports | - | 1 (60 W) |
| USB-A ports | - | 2 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | - | 1 |
| Charging | ||
| AC charging | 660 W | 100 W |
| Full AC charge time | 1 h | - |
| Max solar input | 220 W | 120 W |
| Solar input voltage | 11-50V, 13A | 12-30V, 6A max (AC + solar combined up to 220W) |
| Car charging | 100 W | - |
| Build | ||
| Weight | 13.2 lb (6 kg) | 9.4 lb (4.3 kg) |
| Dimensions | 10.6 x 10.2 x 7.7 in | 11.7 x 7.2 x 7 in |
| App | EcoFlow app (Wi-Fi and Bluetooth) | Dabbsson app |
| Warranty | - | 5 years |