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 Duracell G800 rates 2.5 among mid-size ones. The EcoFlow RIVER 2 Max 500 costs $370 less ($329 vs $699).
Duracell G800
#40 in Mid-sizeFull review
For occasional home backup and outdoor gatherings where the familiar brand, easy recharging and design matter more than price or battery life. Made under license by Southern Telecom; LiFePO4 stations at this price last far longer.
Amazon $699$699
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 | Duracell G800 |
|---|---|---|
| Overall rating | 4.0/5 | 2.5/5 |
| Value 25% | 82 $0.66 per rated Wh | 0 $1.13 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 51 81% of rated capacity delivered (1 test) |
| Battery life 15% | 76 LiFePO4, 3,000 cycles | 15 Li-ion NMC, 500 cycles, 2-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 | 47 0-100% on AC in 2 h 30 min |
| Portability 10% | 70 83 Wh per kg (13.2 lb (6 kg)) | 46 70 Wh per kg (19.4 lb (8.8 kg)) |
| Solar input 5% | 34 220 W max solar input | 17 180 W max solar input |
| Features 5% | 40 100 W USB-C, app | 55 UPS (15 ms), 100 W USB-C |
Independent capacity tests
EcoFlow RIVER 2 Max 500
No independent test published yet.
Duracell G800
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| CNET | 503 Wh | 81% | 480W load logged with HOBOware; round-trip efficiency 65.90%; recharge from empty 3 h 37 min. |
Specifications
| EcoFlow RIVER 2 Max 500 | Duracell G800 | |
|---|---|---|
| Battery | ||
| Rated capacity | 499 Wh | 620 Wh |
| Tested usable capacity | - | 503 Wh (81%) |
| Chemistry | LiFePO4 | Li-ion NMC |
| Cycle life | 3,000 to 80% | 500 to 80% |
| Expandable | No | No |
| Output | ||
| AC output | 500 W (1,000 W surge) | 800 W |
| Boost mode (resistive loads) | 1,000 W | - |
| AC outlets | 4 total | 3 total |
| 120V 15A outlets (NEMA 5-15R) | 2 | 3 |
| 120V 2-prong outlets (NEMA 1-15R) | 2 | - |
| AC waveform | Pure sine wave | Pure sine wave |
| USB-C ports | - | 2 (up to 100 W each) |
| USB-A ports | - | 3 |
| 12 V car outlet | Yes | Yes |
| UPS / pass-through | - | Yes (15 ms switchover) |
| Charging | ||
| AC charging | 660 W | - |
| Full AC charge time | 1 h | 2 h 30 min (2.5 h in fast-charge mode, 4 h at the normal rate; 0-80% in under an hour in fast mode (manufacturer)) |
| Max solar input | 220 W | 180 W |
| Solar input voltage | 11-50V, 13A | Up to 30V (XT-60 input) |
| Car charging | 100 W | - |
| Build | ||
| Weight | 13.2 lb (6 kg) | 19.4 lb (8.8 kg) |
| Dimensions | 10.6 x 10.2 x 7.7 in | 12.5 x 8.3 x 11.5 in |
| App | EcoFlow app (Wi-Fi and Bluetooth) | - |
| Warranty | - | 2 years |
| Released | 2022-11 | 2024-08 |