EF ECOFLOW RIVER 3 Plus Extra Battery EB300, 286Wh

EF ECOFLOW RIVER 3 Plus Extra Battery EB300 adds 286Wh of storage to a RIVER 3 Plus or can be used separately as a battery pack with a 140W USB-C port. It suits buyers seeking extra energy for compatible power-station use or portable charging for smaller devices, but it is an expansion battery rather than a standalone power station with a broad range of outputs.

At a glance

Adds 286Wh when connected to a RIVER 3 Plus, for a stated combined capacity of 572Wh.
Can be used independently through its 140W USB-C port for small-device charging and recharging the battery.
When connected to the RIVER 3 Plus, the listing says it can charge using solar, AC power or a car.
The manufacturer describes LFP chemistry and claims an IP65 rating, drop testing and protective monitoring.

Price

$135.15Save 15%

Reference price: ~~$159.00~~

Price checked: Nov 14, 2026

View offer Ahead of Black FridayExplore the selection

Often bought together

MRINCA Carrying Case Compatible with ECOFLOW RIVER 3/RIVER 3 Plus | Portable Power Station Bag with Shoulder Strap, Protective Cover with Multiple Pockets & Quick Access for Accessories

$29.99

Pros and cons

Pros

Adds capacity to a compatible RIVER 3 Plus without extra connection cables or screws, according to the listing.
Its USB-C port allows the battery to be used on its own for small-device charging.
The listing describes three charging approaches when connected to the RIVER 3 Plus.

Cons

Standalone use is described through a single 140W USB-C port, so this is not presented as a multi-output power station when used on its own.

Technical specifications

13 specifications

Identity
Brand	EF ECOFLOW
Model	EF-RV-E01-1

Power and battery
Power configuration	Battery Powered
Added energy storage	286Wh
USB-C port output	140W
Battery chemistry	LFP

Dimensions and installation
Dimensions listed	9.2 x 8.8 x 4.3 inches
Connection to RIVER 3 Plus	Simple pogo pin connection

Charging and protection claims
Charging methods	3 Charging Methods
Charge time when connected to RIVER 3 Plus	as fast as 1.5 hr
Ingress protection rating	IP65
Drop-test height claimed	3.3 ft
Casing rating	UL 94V-0-rated

What to know before buying

The stated 1.5-hour charging time applies when connected to a RIVER 3 Plus. Solar, AC and car charging are also described for that connected setup. The listing's examples of 7.2 hours for a car fridge and 42 minutes for a travel kettle are usage claims, not universal runtimes.

What’s in the box

RIVER 3 Plus Extra Battery EB300Included
Quick Start GuideCheck selected pack
5-Year ServiceCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

RIVER 3 Plus owners who want to increase listed storage to 572Wh.
Travelers or campers who want a separate battery pack with USB-C charging for smaller devices.
Buyers seeking an expansion battery for compatible power-station use.

Less suited to

People seeking a standalone power station with multiple output types.
Buyers who need a large-capacity battery without owning or planning to use a RIVER 3 Plus.

EF ECOFLOW RIVER 3 Plus Extra Battery EB300, 286Wh · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.9 / 5 · 62 ratings

5 stars92%92%
4 stars6%6%
3 stars0%0%
2 stars2%2%
1 star0%0%

Customer feedback says the battery works as expected and highlights its engineering quality. The aggregate ratings are strongly positive, but ratings alone do not establish particular performance outcomes. For buyers using it as a RIVER 3 Plus expansion or for USB-C charging, confirm that the claimed capacity and connection meet the intended setup.

Positive themes

Customers reportedly appreciate its functionality and engineering quality.

Frequently asked questions

Can the EB300 work without a RIVER 3 Plus?

The listing says it can be used independently through its 140W USB-C port for charging small devices and recharging the battery. The solar, AC and car charging methods are described when it is connected to a RIVER 3 Plus.

How much capacity does it add to a RIVER 3 Plus?

The listing states that the EB300 adds 286Wh and brings the combined storage to 572Wh when paired with a RIVER 3 Plus.

How does it connect to the RIVER 3 Plus?

The listing describes a pogo pin connection and says it stacks without extra cables or screws.

What comes in the package?

The explicit included-components field names the RIVER 3 Plus Extra Battery EB300. The feature text also claims a Quick Start Guide and 5-Year Service, so check the selected listing for those items.