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 $329$329
The EcoFlow RIVER 2 Max 500 rates 4.0 among small portable power stations; the EcoFlow RIVER 2 Pro rates 3.8 among mid-size ones. The EcoFlow RIVER 2 Max 500 costs $110 less ($329 vs $439).
EcoFlow RIVER 2 Pro
#30 in Mid-sizeFull review
A 768Wh LiFePO4 station for camping and short outages that recharges from the wall in about an hour. Worth it at a discount, but newer models offer more USB-C and solar input.
Amazon $439$439
Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different size classes (small and mid-size), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | EcoFlow RIVER 2 Max 500 | EcoFlow RIVER 2 Pro |
|---|---|---|
| Overall rating | 4.0/5 | 3.8/5 |
| Value 25% | 82 $0.66 per rated Wh | 70 $0.57 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 44 80% of rated capacity delivered (2 tests) |
| Battery life 15% | 76 LiFePO4, 3,000 cycles | 91 LiFePO4, 3,000 cycles, 5-year warranty |
| AC output 15% | 72 500 W continuous AC | 30 800 W continuous AC |
| Charging speed 10% | 95 0-100% on AC in 1 h | 89 0-100% on AC in 1 h 10 min |
| Portability 10% | 70 83 Wh per kg (13.2 lb (6 kg)) | 87 93 Wh per kg (18.2 lb (8.3 kg)) |
| Solar input 5% | 34 220 W max solar input | 16 220 W max solar input |
| Features 5% | 40 100 W USB-C, app | 75 UPS (30 ms), 100 W USB-C, app |
Independent capacity tests
EcoFlow RIVER 2 Max 500
No independent test published yet.
EcoFlow RIVER 2 Pro
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 620 Wh | 80.7% | Spec table lists 620 Wh measured output and 81% usable; review text says 600 Wh. Load not stated. Measured full recharge about 75-78 minutes. |
| nextpit | 604 Wh | 78.6% | Full discharge of the 230V European model; 887 Wh drawn from the wall to recharge. |
Specifications
| EcoFlow RIVER 2 Max 500 | EcoFlow RIVER 2 Pro | |
|---|---|---|
| Battery | ||
| Rated capacity | 499 Wh | 768 Wh |
| Tested usable capacity | - | 612 Wh (80%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 3,000 to 80% | 3,000 to 80% |
| Expandable | No | No |
| Output | ||
| AC output | 500 W (1,000 W surge) | 800 W (1,600 W surge) |
| Boost mode (resistive loads) | 1,000 W | 1,600 W |
| AC outlets | 4 total | 4 total |
| 120V 15A outlets (NEMA 5-15R) | 2 | 4 |
| 120V 2-prong outlets (NEMA 1-15R) | 2 | - |
| AC waveform | Pure sine wave | Pure sine wave |
| USB-C ports | - | 1 (100 W) |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | - | 2 |
| UPS / pass-through | - | Yes (30 ms switchover) |
| Charging | ||
| AC charging | 660 W | 940 W |
| Full AC charge time | 1 h | 1 h 10 min (0-100% in 70 minutes (manufacturer)) |
| Max solar input | 220 W | 220 W |
| Solar input voltage | 11-50V, 13A | 11-50V, 13A |
| Car charging | 100 W | 100 W |
| Build | ||
| Weight | 13.2 lb (6 kg) | 18.2 lb (8.3 kg) |
| Dimensions | 10.6 x 10.2 x 7.7 in | 10.6 x 10.2 x 8.9 in |
| App | EcoFlow app (Wi-Fi and Bluetooth) | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | - | 5 years |
| Released | 2022-11 | 2022-11 |