Match the main unit
Check the exact host model and connection before choosing an extra battery.
EcoFlow RIVER 3 Plus Smart Extra Battery (286Wh/572Wh)
EB300
$159.00
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AUTHORIZED ECOFLOW RESELLER
EcoFlow RIVER 3 Plus Extra Battery
Choose the reserve that fits your routine.
$159.00
286WhEB300 capacity
572WhEB600 capacity
140WUSB-C maximum
PogoSupported attachment
EXTRA 5% OFF APPLIED AT CHECKOUT
Extra battery only. Select EB300 or EB600; RIVER 3 Plus is not included.
Free shipping · Contiguous 48 U.S. statesEstimated delivery: 5–8 business days1–3 business days processing + approximately 4–5 in transit.
Genuine EcoFlow · Direct U.S. warehouse fulfillment
5-year manufacturer warranty
Coverage is subject to EcoFlow’s U.S. warranty terms.CHOOSE IT FOR YOUR PLANS.
Choose the reserve that fits your routine.
The EcoFlow RIVER 3 Plus Smart Extra Battery page offers EB300 and EB600 options. Match the selected battery to the energy reserve you want, and check the variant selector for current purchase availability.
Add stored energy
A larger reserve can extend runtime without changing the host’s output rating.
Plan the connection
Check cables, supported battery count and firmware requirements.
KNOW YOUR CONFIGURATION.
Select the battery, then check availability.
Use EB300 or EB600 with RIVER 3 Plus to add stored energy. The selector shows current availability for each option. AC output stays with the main station; the battery’s USB-C port is a separate capability.
Extra battery only. Select EB300 or EB600; RIVER 3 Plus is not included.
KNOW YOUR CONFIGURATION.
The details, in one place.
Specifications refer to the model and configuration described. Actual performance depends on operating conditions. Optional equipment is sold separately unless expressly included.
- Options
- EB300 or EB600; select above
- EB300 storage
- 286Wh
- EB600 storage
- 572Wh
- Host total capacity
- 572Wh with EB300 / 858Wh with EB600
- USB-C
- Up to 140W with compatible equipment
- Manufacturer warranty
- 5-year manufacturer warranty
Before you order
- Confirm the exact host and battery model.
- Check required cable, adapter and firmware.
- Select the intended variant and review its availability.
BUY WITH CLARITY.
Good questions. Clear answers.
Is a main power station included?
No. This listing is for the extra battery only. The compatible main station is sold separately.
Does adding capacity increase AC output?
No. More watt-hours can extend runtime, but the main unit’s rated output and port limits still apply.
Can I use the USB-C port separately?
A compatible USB-C device and cable can use the supported input/output function, up to 140W. This does not provide standalone household AC outlets.
Which option should I choose?
Choose by desired capacity and current variant availability. EB300 is 286Wh and EB600 is 572Wh.
When will my order arrive?
Allow 1–3 business days for processing and approximately 4–5 business days in transit for available items. Delivery times are estimates. Check the selected option’s availability before ordering.
Shipping & delivery ↗What warranty applies?
5-year manufacturer warranty. Coverage is subject to EcoFlow’s U.S. warranty terms.
EcoFlow warranty terms ↗What is the return policy?
Review NOVANEST’s current Returns & Refunds Policy for eligibility, timing and return-shipping details. Contact us for help with an order.
Returns & Refunds Policy ↗Full product description
EcoFlow RIVER 3 Plus Extra Battery EB300/EB600: choose expansion capacity for your river 3 plus
The EcoFlow RIVER 3 Plus Smart Extra Battery page offers EB300 and EB600 options. Match the selected battery to the energy reserve you want, and check the variant selector for current purchase availability.
Key specifications and configuration
- EB300 battery capacity: 286Wh.
- EB600 battery capacity: 572Wh.
- RIVER 3 Plus combined capacity: 572Wh with EB300, or 858Wh with EB600.
- Supported cable-free attachment to RIVER 3 Plus.
- Additional USB-C input and output: up to 140W with compatible equipment.
Select the correct battery variant
This listing is for an extra battery; the RIVER 3 Plus main station is not included. The main station's AC output rating stays the same when capacity is added. The battery's USB-C capability does not mean it provides standalone AC outlets. Confirm device, cable and USB power requirements before using it separately.
If you want the main station and EB300 together, compare the RIVER 3 Max bundle. Choose the battery size based on the current station model and desired runtime.
The right power starts with your needs.
Tell us what you want to run and for how long. We’ll help you narrow it down.