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popular Posted by David_David • Jul 3, 2025
popular Posted by David_David • Jul 3, 2025

EcoFlow RIVER 3 Plus Smart Extra Battery EB600 $319.99

$320

$418

23% off
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Costco NEXT Ecoflow has added River 3 Plus Plug and Play EXTRA Batteries at discounted prices

EB300 (286Wh) $159.99 (regular $209-269 Ecoflow Direct/Amazon)
EB600 (572Wh) $319.99 (regular $418-549 Ecoflow Direct/Amazon)

EB600 Plug and Play Triples the capacity of River 3 Plus/Wireless from 286Wh to 858Wh.
Adds USB-C port for USB-Input charging

Good pickup for all those who bought the Costco River 3 Plus Wireless deal to add capacity.

Need to be Costco member. Logged into account, and click thru to Ecoflow Costco Next Portal costco.ecoflow.com

https://costco.ecoflow.com/produc...tery-eb600
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Deal Details
Community Notes
About the Poster
Costco NEXT Ecoflow has added River 3 Plus Plug and Play EXTRA Batteries at discounted prices

EB300 (286Wh) $159.99 (regular $209-269 Ecoflow Direct/Amazon)
EB600 (572Wh) $319.99 (regular $418-549 Ecoflow Direct/Amazon)

EB600 Plug and Play Triples the capacity of River 3 Plus/Wireless from 286Wh to 858Wh.
Adds USB-C port for USB-Input charging

Good pickup for all those who bought the Costco River 3 Plus Wireless deal to add capacity.

Need to be Costco member. Logged into account, and click thru to Ecoflow Costco Next Portal costco.ecoflow.com

https://costco.ecoflow.com/produc...tery-eb600

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12 Comments

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Jul 3, 2025
322 Posts
Joined Sep 2013
Jul 3, 2025
RikB
Jul 3, 2025
322 Posts
This product and it's pricing just doesn't make sense to me. It's neat that you can expand the capacity of the R3P, but it should be $200-250 normally. The R3P frequently goes on sale for $180-200 so buying 3 seperate main units would be smarter than 1 r3p+expansion. Even with this you still get less capacity than a delta 2 and youre limited by the 600 watt/3 outlet output.

Delta 2 has been popping up at $350 refurbished. If you need the UPS feature then the Delta 3 refurb has been <$500 recently. A R3P+EB600 on sale is still $500 and is physically the same size as the Delta units but worse in battery capacity and max output.
1
Original Poster
Pro
Jul 3, 2025
73 Posts
Joined Mar 2025
Jul 3, 2025
David_David
Jul 3, 2025
Original Poster
Pro
73 Posts
The name of this game is size, portability and use case. And of course assuming you already have a R3P.
R3P Extra Battery also adds USB-C input charging convenience.

You make valid considerations, but also brand new vs Refurb pricing you mention isn't reasonable comparison. Of Course refurbs are less, but also Refurbs aren't for everyone.
River 3 Plus +EB is not same physical size, and considerably smaller and lighter than ANY delta (including Delta Mini long retired and discontinued)
River 3 Plus is also latest current model, all the latest app features, <10ms UPS and ultra-quiet. D2 is very loud and slower switch over.
2
Jul 3, 2025
158 Posts
Joined May 2012
Jul 3, 2025
jcricket006
Jul 3, 2025
158 Posts
Quote from RikB :
This product and it's pricing just doesn't make sense to me. It's neat that you can expand the capacity of the R3P, but it should be $200-250 normally. The R3P frequently goes on sale for $180-200 so buying 3 seperate main units would be smarter than 1 r3p+expansion. Even with this you still get less capacity than a delta 2 and youre limited by the 600 watt/3 outlet output.

Delta 2 has been popping up at $350 refurbished. If you need the UPS feature then the Delta 3 refurb has been <$500 recently. A R3P+EB600 on sale is still $500 and is physically the same size as the Delta units but worse in battery capacity and max output.
I agree. I have the R3P and I really like it, however I also don't see a point in these expansion batteries at this price. Once you attach one of these, the R3P is no longer that portable and not THAT much lighter than something like the Delta 3 Plus (10lb difference). If I needed more wattage, I would honestly rather get one of the larger ecoflow units or another R3P.
Jul 3, 2025
582 Posts
Joined Nov 2017
Jul 3, 2025
Rudedog7
Jul 3, 2025
582 Posts
Been waiting for the price to drop on these even more. I was able to hookup an existing 100ah battery to my River 3+ with a ring connector to xt60 connector. It's for a backup on a server rack so I haven't had to worry about charging it really.
Jul 4, 2025
170 Posts
Joined Sep 2019
Jul 4, 2025
jobe24
Jul 4, 2025
170 Posts
Quote from Rudedog7 :
Been waiting for the price to drop on these even more. I was able to hookup an existing 100ah battery to my River 3+ with a ring connector to xt60 connector. It's for a backup on a server rack so I haven't had to worry about charging it really.

Do you have everything connected to the R3P or do you use a UPS in front of the R3P?
Jul 4, 2025
372 Posts
Joined Nov 2018
Jul 4, 2025
madsci1016
Jul 4, 2025
372 Posts
Quote from Rudedog7 :
Been waiting for the price to drop on these even more. I was able to hookup an existing 100ah battery to my River 3+ with a ring connector to xt60 connector. It's for a backup on a server rack so I haven't had to worry about charging it really.
This is the way. I bought 48V 30AH LiTime for $350 and i get 1500wh extra for any size Ecoflow i have. Make sure to get the funky version of the XT60 with the third pin that tricks the ecoflow into thinking it's a solar input.
Jul 4, 2025
582 Posts
Joined Nov 2017
Jul 4, 2025
Rudedog7
Jul 4, 2025
582 Posts
Quote from jobe24 :
Do you have everything connected to the R3P or do you use a UPS in front of the R3P?
Just have the rack plugged into the R3P. It has the 10 ms response and haven't had an issue with it.

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Jul 5, 2025
4,268 Posts
Joined Nov 2006
Jul 5, 2025
Zanthexter
Jul 5, 2025
4,268 Posts
Quote from RikB :
This product and it's pricing just doesn't make sense to me. It's neat that you can expand the capacity of the R3P, but it should be $200-250 normally. The R3P frequently goes on sale for $180-200 so buying 3 seperate main units would be smarter than 1 r3p+expansion. Even with this you still get less capacity than a delta 2 and youre limited by the 600 watt/3 outlet output.

Delta 2 has been popping up at $350 refurbished. If you need the UPS feature then the Delta 3 refurb has been <$500 recently. A R3P+EB600 on sale is still $500 and is physically the same size as the Delta units but worse in battery capacity and max output.
River 3+ idle power consumption is about 8W.
Delta 3+ idle power consumption is about 35W.

So, a CPAP uses 30-60W, so lets go with 45W, and add 8W, so 53W/hr. 8hrs = 424W
Same math, but adding 35W = 640W

So, 1024 / 640 = 1.6 x 8 = 12.8, so lets say 13 hours running the CPAP.= on the Delt 3+
And 858 / 424 = 2 x 8 = 16, so 16 hours running the CPAP on the River 3+.

The River 3 @ $220 + the EB600 @ $320 = $520, slightly less than the $550 Wellbots sale price for the 3+.

So, costs slightly less, runs CPAP significantly longer.

Also the tall stacked shape fits better on my nightstand. Power flips off in the middle of the night, I keep sleeping.

The River 3 Max + combo will run my CPAP, plus charge my phone, my watch, and my cochlear for 3 nights. I've tested it. Hurricane season has already started.

Also, it has a light, the EB600 can be charges separately, and so on.

There's more to the decision than maximum capacity and maximum wattage.

I wouldn't use the River 3+ for my rotary hammer drill, but I do use it as a UPS for point of sale systems. About a dozen so far, we're waiting on a sale to order more. It's compact and fits under the counter nicely. The Delta 3+ is much too big.

And so on.

People always wanting MOoooo PPoooowwwaaahh remind of the guys with the YUUUGGEE trucks getting 16MPG picking up groceries and commuting solo to their office jobs. Meanwhile a lot of men that do actual work prefer smaller trucks, because you can more easily load and unload them when you don't need a ladder to reach into the beds.

Sure, there's definitely uses for bigger batteries, I own the Delta 3+ as well. Just as there's uses for big pickup trucks, like loading up several sheets of drywall instead of a few buckets of paint and a couple ladders. And big 18v drills and compact 12v drills. (I love my Surge.)

Fit the tool to the task.
1
Last Tuesday
67 Posts
Joined Jun 2019
Last Tuesday
SharpTent6356
Last Tuesday
67 Posts
This deal is (was?) better than the current Amazon days pricing. $338.99 ($362.72 w/ tax) on Amazon right now, with some sort of 5% coupon.
With this deal, I'm at $342.39 all in, with taxes. I have the R3P Plus Wireless - it's awesome!
Last Wednesday
1,249 Posts
Joined Jul 2015
Last Wednesday
arooni
Last Wednesday
1,249 Posts
have a river 3 plus wireless from costco; not sure what the use case is for the eb600 or eb300. how are you guys using this?

river 3 plus + 220 w folding solar panel is perfect for a remote work day powering a m1 max + s25 ultra phone in hotspot mode.

what do you guys use the eb300/eb600 to do?
Last Wednesday
116 Posts
Joined Dec 2010
Last Wednesday
thabrownwonder
Last Wednesday
116 Posts
its 299 now, is that a good deal
Last Wednesday
4,505 Posts
Joined Jul 2006
Last Wednesday
Commentary
Last Wednesday
4,505 Posts
Quote from Rudedog7 :
Just have the rack plugged into the R3P. It has the 10 ms response and haven't had an issue with it.
If I do this setup for my desktop computer, will the response time be adequate? Or should I plug desktop into a UPS and then into the R3P? Any issues with a UPS in conjunction with the R3P?

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