EcoFlow River 2 Max Portable Power Station review
By Tom Calder
A well-judged mid-size unit for household backup: the long-life LFP battery, genuinely fast recharge and quiet operation make it a sensible first power station. Just size it to essentials, not the whole house.
- Best for
- Keeping the essentials going in a power cut — fridge, broadband router, phones and a few lights.
- Skip it if
- You want to power high-draw appliances (kettle, microwave, heaters) or keep much of the home running
as of 2 Nov 2026, 16:07 GMT · Details
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- LFP (lithium iron phosphate) battery rated for roughly 3,000 cycles / ~10 years — far longer-lived than older lithium units
- Recharges 0-100% in about an hour from the mains, so it is ready again quickly between outages
- Light (~6.1kg), quiet, and ships with proper UK 3-pin sockets plus a 100W USB-C port
Worth knowing
- 512Wh is modest — enough for low-draw essentials for several hours, not for running a home for a day
- Native 500W output means high-wattage appliances need X-Boost, and it still will not run a kettle, oven or electric heater
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Our review
The EcoFlow River 2 Max is a 512 Wh power station with a 500 W inverter, a lithium iron phosphate battery rated for 3,000 cycles and a one-hour mains recharge. At about 6.1 kg it is the size you can carry to the fridge in one hand. It will run a router, phones, lights and a fridge in turns for an evening or more; it will not run a kettle or a heater.
What EcoFlow says it does
EcoFlow's manual gives a 512 Wh battery (20 Ah at 25.6 V), AC output of 500 W total with a 1,000 W peak and X-Boost up to 1,000 W for simple heating loads, which it runs at reduced voltage rather than full power. Mains input is up to 660 W, for a full charge in about an hour. Solar input is 11 to 50 V at up to 13 A and 220 W, which EcoFlow puts at three to six hours in good sun. Ports are a USB-C at 100 W in or out, USB-A sockets at 12 W each, a 12 V car socket at up to 126 W and a car charging input at 100 W.
The battery is lithium iron phosphate, rated to keep over 80% of its capacity after 3,000 cycles. The emergency power supply function switches to battery within 30 ms when the mains fails, which the manual says is not the same as a true zero-gap UPS. It measures 270 by 260 by 196 mm and weighs approximately 6.1 kg. It discharges from minus 10°C to 45°C and charges from 0°C to 45°C. EcoFlow's UK warranty is five years.
What 512 Wh buys you
A broadband router and a couple of phones use perhaps 15 W together, so this unit keeps the internet up for a day and more. A modern fridge-freezer averages 40 to 60 W over a cycle, so expect roughly eight hours before the battery is flat, less if the compressor starts often. Our guide to running a fridge from a power station explains how to measure your own, and what size power station do I need walks through the sums.
The 500 W limit is the real constraint. Kettles, toasters, microwaves and fan heaters all exceed it, and X-Boost only lets some of them run slowly. If those matter, you need a Delta-class unit.
Looking after it
The manual asks you to discharge and recharge the unit every three months if it is stored, taking it to empty and then back to 60%, and warns that leaving it untouched for more than six months voids the warranty. Charge indoors on a hard surface away from anything flammable; the London Fire Brigade's battery advice applies to a power station as it does to an e-bike. Our lithium battery fire safety guide covers storage and charging. Note that the manual's photographs show European sockets and says the AC cable varies by country; the UK model carries three-pin sockets.
How it compares
On the EcoFlow page the newer River 3 Plus has a smaller 286 Wh battery but a 600 W inverter and can clip on an extra battery, and the River 2 Pro steps up to 768 Wh and 800 W. The small River 3 is 245 Wh and 300 W. Against other brands, the Bluetti Elite 30 V2 is 288 Wh and 600 W, and Jackery's Explorer 500 v2 matches the 512 Wh and 500 W at 5.7 kg. The River 2 Max is the older design, which tends to mean a lower price for the same capacity; it gives up the expandability and the slightly faster switchover of the River 3 family.
Our verdict
Buy it as a first power station for a household whose essentials are the router, phones, lights and a fridge in turns, and that wants a long-lived battery at the lower end of the price range. Skip it if you need to run a kettle, a heater or a medical device that cannot tolerate a 30 ms gap, or if you expect to add batteries later; the River 3 Plus or a Delta 3 is the better foundation.
A researched review, built from the maker's specs, manual and UK listings; facts checked 2 Nov 2026. Sources: EcoFlow UK: River 2 Max portable power station; EcoFlow: River 2 Max user manual V1.0 (PDF); EcoFlow UK: warranty policy; London Fire Brigade: batteries and chargers.
Who shouldn't buy this
You want to power high-draw appliances (kettle, microwave, heaters) or keep much of the home running — the capacity and 500W output are too small; step up to a Delta-class unit instead.
Key specs
| Capacity | 512 Wh |
| Output | 500 W |
| Weight | 6.1 kg |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for The cheapest way to keep a router, phones, lights and a laptop running through an evening's power cut, from a brand with a five-year warranty.
Best for Phones, a router, a laptop and lamps through an evening's power cut, in a unit you can carry with one hand.
Best for Keeping phones, a tablet and even a laptop charged through a day-long power cut, and carrying onto a flight.
See the comparison →Questions
Can the EcoFlow River 2 Max run a fridge?
Yes, for a time. A typical household fridge-freezer averages well under 100 W, so 512 Wh gives several hours; check the compressor's starting surge against the 1,000 W peak and measure your own fridge with a plug-in meter.
How long does it take to charge?
About one hour from the mains at up to 660 W, according to EcoFlow's manual, or three to six hours from a 220 W solar panel in good sun.
Can I use it as a UPS for a router?
The manual says it switches to battery within 30 ms when the mains fails, which is fine for a router and most electronics, but it does not support zero-gap switching for sensitive equipment.
How should I store it between power cuts?
EcoFlow's manual says to discharge it to empty and recharge to 60% every three months, and that a unit left untouched for more than six months is not covered by the warranty.
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