EcoFlow EB300 Extra Battery for RIVER 3 Plus · 286 Wh

Give your RIVER 3 Plus a longer working window. The EB300 adds 286 Wh of energy to a compatible base station, doubling its total capacity from 286 Wh to 572 Wh. A useful upgrade when you want selected desk equipment and lighting to run longer between charges.

Choose the right battery

• Designed for EcoFlow RIVER 3 Plus.
• 286 Wh LFP battery with a dedicated stacking connection; no extra connection cable is needed between the compatible units.
• USB-C input and output up to 140 W, including independent charging of compatible USB-C electronics.

What extra runtime could it give?

Calculated estimates use capacity × 75–85% ÷ continuous average load. The 200 W desk example combines a 40 W e-file, 100 W dust collector, 48 W curing lamp and 12 W task light. Actual device power, duty cycles, temperature, battery condition and inverter losses change runtime. These figures are not manufacturer runtime guarantees.

Expansion limits

The station accepts one EB300 or one EB600 battery at a time. EB300 gives a total of 572 Wh; the larger EB600, sold separately when available, gives 858 Wh. The RIVER 3 Max Plus Wireless 858 Wh configuration already includes its larger expansion battery and does not accept another battery on top.

Continuous AC output remains 600 W for the complete RIVER 3 Plus system. EB300 has no household AC sockets of its own and is not an expansion battery for DELTA stations. The RIVER power station is sold separately.

Availability & delivery

Supplied from our EU partner warehouse via our Estonia fulfilment hub. Transfer to Estonia usually takes 2–4 working days, plus onward delivery. Live availability is synchronized with INNPRO.