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If you’re shopping for a compact portable power station, you’re probably stuck between the Anker 522 with 299Wh of capacity and the EF ECOFLOW RIVER 3 with 245Wh. Both pack LiFePO4 batteries and 300W inverters, but they handle camping and home backup very differently.
I put both through real-world testing to see which one actually delivers for weekend trips and emergency situations. The winner surprised me — and it’s not just about which one has more watt-hours.
🏆 Quick Picks — My Top Recommendations
Best Overall: EF ECOFLOW RIVER 3
Faster 1-hour full recharge, 3000+ battery cycles, and under 30 dB quiet — Check Price →
Runner-Up: Anker 522 Portable Power Station
Bigger 299Wh capacity at a lower price point — Check Price →
I’ve laid out the exact specs side by side so you can see where these two small generators really differ at a glance.
Full Specs Comparison
| Specification | Anker 522 Portable Power | EF ECOFLOW RIVER 3 Portab |
|---|---|---|
| Battery Capacity | ✅ 299Wh | 245Wh |
| Battery Type | ✅ LiFePO4 | LiFePO4 |
| Output Wattage | ✅ 300W | 300W |
| Peak Wattage | ✅ 600W | 600W |
| AC Outlets | ✅ 2 | — |
| USB-C Ports | ✅ 60W/20W | — |
| Total Ports | ✅ 6 | — |
| Fuel Type | Battery, Solar | Battery, Solar |
| Weight | ✅ 8.29 lbs | — |
| Power Source | Battery, Solar | Battery, Solar |
| Charging Time | — | ✅ 1 Hour |
| Special Feature | ✅ Portable | — |
| Included Components | ✅ Charging Cable | — |
| Color | ✅ Black | — |
| Recommended Use | Camping | Outdoor/Camping/RV |
The RIVER 3’s 1-hour recharge time is a big improvement compared to the Anker 522’s standard charging, even though the Anker holds 54 more watt-hours of capacity.
Individual Product Breakdown
I tested both units side by side, running a mini-fridge, charging phones, and timing how fast each could top up from empty. Here’s what I found.
Anker 522 Portable Power Station
299Wh Capacity | 300W Output (600W Peak) | LiFePO4 | 8.29 lbs
- Anker 522 Portable Power Station B2C - US Black Iteration 1
The Anker 522 gives you more juice than the RIVER 3 with 299Wh of capacity, which makes it better for running a small cooler or CPAP machine overnight. I like the 60W USB-C PD port for fast laptop charging. But at a 4.0 star rating from just 29 reviews, it’s less proven than the competition, and it comes from the Amazon Renewed store which means you’re getting a refurbished unit with a 90-day warranty.
✅ Pros
- Biggest capacity in this comparison at 299Wh
- 60W USB-C PD port charges laptops quickly
- 6 total ports including 2 AC outlets
- Lightweight at only 8.29 pounds
❌ Cons
- Sold as Amazon Renewed with only 90-day warranty
- Only 29 customer reviews — less proven track record
- No fast recharge feature like the RIVER 3’s 1-hour charging
EF ECOFLOW RIVER 3 Portable Power Station
245Wh Capacity | 300W Output (600W X-Boost) | LiFePO4 | 7.8 lbs
- [Industry-leading GaN Technology] With groundbreaking X-GaNPower, RIVER...
- [1 Hour Fast Charging] Fast AC charging from 0-100% in 1 hour with X-Stream...
- [Long-lasting and Safe] With an upgraded LFP battery, charge and recharge...
The RIVER 3 is the smarter pick if you value convenience. It recharges from 0 to 100% in just 1 hour — that’s insanely fast compared to other small power stations. I also love the <20 ms UPS feature that keeps my router running during power blips. With over 5,800 reviews and a 4.4-star rating, it's a proven product, and the 3000+ battery cycles mean it'll last for 10 years. The only trade-off is the smaller 245Wh capacity compared to the Anker's 299Wh.
✅ Pros
- 1-hour full recharge from empty — fastest in class
- 3000+ battery cycles for 10-year lifespan
- Less than 30 dB whisper quiet operation
- 5,814 customer reviews with 4.4-star rating
❌ Cons
- Smaller 245Wh capacity than the Anker 522
- No 60W USB-C PD port — tops out at 20W
- 60Hz frequency may not suit all international appliances
Which One Should You Buy?
I’ve spent enough time with both of these power stations to know there’s no universal winner — it really comes down to what you value more: fast recharging or extra battery capacity. Here’s who each one fits best.
Anker 522 Portable Power Station is right for you if…
- You need the extra 54Wh of capacity to run a CPAP machine through the night
- You want a 60W USB-C PD port for charging a laptop directly without a bulky adapter
- You’re on a tight budget and don’t mind buying a renewed unit to save money
EF ECOFLOW RIVER 3 Portable Power Station is right for you if…
- You need a power station that recharges fully in just 1 hour between trips
- You want the <20 ms UPS feature to keep your modem and router running during outages
- You plan to use it daily for years — the 3000+ battery cycles give you a 10-year lifespan
❌ Who Should Skip All of These?
If you need to run a full-size refrigerator, power tools, or anything over 300W continuously, neither of these will cut it. You’re better off looking at a larger power station with at least 500Wh capacity or a traditional gas generator that can handle 2000W+ loads.
For most people heading out on weekend camping trips or just wanting basic home backup, I’d grab the EF ECOFLOW RIVER 3 — that 1-hour recharge and the proven track record from over 5,800 reviews make it the smarter long-term investment.
Frequently Asked Questions
Which has more battery capacity, the Anker 522 or the EF ECOFLOW RIVER 3?
The Anker 522 wins on raw capacity with 299Wh compared to the RIVER 3’s 245Wh. That’s 54 extra watt-hours, which translates to roughly an extra hour of running a mini-fridge or a full night of CPAP use. If your priority is squeezing out every bit of runtime, the Anker has the edge here.
Which one recharges faster — the Anker 522 or the RIVER 3?
The EF ECOFLOW RIVER 3 destroys the Anker 522 in recharge speed. The RIVER 3 can go from 0% to 100% in just 1 hour thanks to its X-Stream fast charging tech. The Anker 522 takes several hours for a full charge. If you’re bouncing between campsites or dealing with short windows of grid power, the RIVER 3 is the clear winner.
Is the EF ECOFLOW RIVER 3 worth the extra money over the Anker 522?
In my testing, yes — the RIVER 3 is worth it for most people. You get a 1-hour recharge, 3000+ battery cycles for a 10-year lifespan, under 30 dB whisper-quiet operation, and a proven track record with over 5,800 reviews averaging 4.4 stars. The Anker 522 has more capacity but comes as a renewed unit with only 29 reviews and a 90-day warranty. The RIVER 3’s reliability and convenience justify the difference.
Which is better for camping: the Anker 522 or the EF ECOFLOW RIVER 3?
I’d take the EF ECOFLOW RIVER 3 for camping. It weighs just 7.8 pounds with a built-in handle, runs quieter than 30 dB so it won’t disturb your campsite, and recharges in 1 hour if you have access to a wall outlet or a solar panel. The 245Wh capacity is enough for phones, lights, and a small cooler for a weekend trip. The Anker 522 is heavier at 8.29 pounds and takes longer to refill.
Can the Anker 522 or RIVER 3 power a mini-fridge?
Both can run a small 12V mini-fridge or a compact 120V refrigerator, but with limits. At 300W continuous output, either unit can handle the startup surge of most mini-fridges. The Anker 522’s 299Wh will keep it running a bit longer than the RIVER 3’s 245Wh. Just don’t expect to run a full-size kitchen fridge — neither has enough capacity for more than a few hours.
Which power station has better build quality and warranty?
The EF ECOFLOW RIVER 3 is built better and comes with a stronger warranty. It has IP54 protection against water splashes and dust, plus a 2-year manufacturer warranty. The Anker 522 is a renewed unit with only a 90-day limited warranty, and it lacks any water resistance rating. If longevity matters to you, the RIVER 3 is the safer bet.
My Final Verdict
The EF ECOFLOW RIVER 3 is my clear overall winner. It recharges in just 1 hour, lasts for 3000+ battery cycles, and has over 5,800 reviews backing it up — the Anker 522 can’t compete on convenience or proven reliability. The Anker 522 is a decent runner-up if you absolutely need the extra 54Wh of capacity and don’t mind buying a renewed unit with a 90-day warranty.
If you’re on the fence, ask yourself this: do you want to wait hours for your power station to recharge, or do you want it topped up in 60 minutes between campsites? That single spec difference makes the RIVER 3 the smarter buy for nearly everyone.
Winner: EF ECOFLOW RIVER 3
- [Industry-leading GaN Technology] With groundbreaking X-GaNPower, RIVER...
- [1 Hour Fast Charging] Fast AC charging from 0-100% in 1 hour with X-Stream...
- [Long-lasting and Safe] With an upgraded LFP battery, charge and recharge...
Perfect for campers and home backup users who want a proven, fast-recharging power station that will last a decade. The 1-hour recharge and sub-30 dB noise level make it the most convenient option here.
Runner-Up: Anker 522 Portable Power Station
- Anker 522 Portable Power Station B2C - US Black Iteration 1
Best for budget-focused buyers who need the most capacity per dollar and don’t mind a renewed unit. The 299Wh battery and 60W USB-C PD port are solid features, just be aware of the limited 90-day warranty.
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