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EcoFlow DELTA Pro Smart Extra Battery

EcoFlow DELTA Pro Smart Extra Battery (3600Wh)
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$1,999.00
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$1,999.00
$1,199.00
$1,199.00 - $1,199.00
$1,199.00
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3600Wh · LFP · Plug-and-Play · 5-Year Warranty

EcoFlow DELTA Pro Smart Extra Battery (3600Wh)

This doubles your DELTA Pro's runtime, and it does it without an installer, a wiring diagram, or a shutdown. One cable connects it, the app sees it immediately, and from that point the two behave as a single 7200Wh system. Add a second and you're at 10,800Wh.

It's the same 3600Wh of LFP cells as the DELTA Pro itself, rated for 6,500 cycles to 50% capacity, and it charges through the DELTA Pro using any of its inputs — including the full 6500W MultiCharge. It can also be charged directly by an EcoFlow Smart Generator with no DELTA Pro attached at all. Renewable Outdoors is an authorized EcoFlow dealer — call us at (303) 876-7654 if you'd like to check what cable your setup needs.

EcoFlow DELTA Pro Smart Extra Battery
5-Year Warranty
Lowest Price Guarantee
Authorized EcoFlow Dealer
Free Shipping
0% APR Financing
Expert Support: (303) 876-7654

Why Add an Extra Battery

3600Wh More Storage

Exactly doubles a DELTA Pro. Two of them take a single unit from 3600Wh to 10,800Wh.

Plug-and-Play

One cable, no configuration. The app recognises it and manages both packs as one bank.

3,500 Cycles to 80%

The same LFP cells as the main unit — 6,500 cycles to 50% capacity, roughly a decade of daily use.

Charges Through Every DELTA Pro Input

AC, solar, car, or 6500W MultiCharge — whatever charges your DELTA Pro charges this too.

Works With a Smart Generator Alone

It can be charged directly by an EcoFlow Smart Generator without a DELTA Pro connected, which is useful for staging power in the field.

Monitored in the App

State of charge, temperature and cycle history for the extra battery, alongside the main unit.

What's Included

EcoFlow DELTA Pro Smart Extra Battery ports

In the Box

  • 1 × EcoFlow DELTA Pro Smart Extra Battery
  • User manual and warranty card

The DELTA Pro extra battery cable is what physically connects this to your power station — check whether you already have one before ordering, and call us at (303) 876-7654 if you're not sure. This battery is specific to the original DELTA Pro; the DELTA Pro 3, DELTA Pro Ultra and DELTA Max each use their own extra battery.

DELTA Pro Smart Extra Battery Specifications

Rated Capacity 3600Wh
Cell Chemistry LFP (LiFePO4)
Cycle Life 6,500 cycles to 50% capacity; 3,500 cycles to 80%
Compatibility DELTA Pro — up to two extra batteries per unit
Charging Charges in unison with the connected DELTA Pro using any of its inputs, including 6500W MultiCharge
Standalone Charging Can be charged directly by an EcoFlow Smart Generator without a DELTA Pro attached
Installation Plug-and-play via the DELTA Pro extra battery cable
Dimensions 25" × 11.2" × 16.4" (63.5 × 28.5 × 41.6cm)
Weight Approx. 84 lbs (38 kg)
Monitoring Visible in the EcoFlow app alongside the main unit
Warranty 5 years

5-Year Warranty

EcoFlow's full 5-year warranty covers the extra battery and its BMS.

Lowest Price Guarantee

Found it cheaper elsewhere? Call us at (303) 876-7654 before you buy.

Authorized EcoFlow Dealer

Genuine EcoFlow hardware with full manufacturer support behind it.

EcoFlow DELTA Pro Smart Extra Battery (3600Wh): Frequently Asked Questions

Which power stations does this work with?
The original EcoFlow DELTA Pro, which supports up to two of these extra batteries. It is not the extra battery for the DELTA Pro 3, the DELTA Pro Ultra, or the DELTA Max — each of those generations uses its own battery and its own cable. If you're unsure which DELTA Pro you own, call us at (303) 876-7654 and we'll identify it from the label.
How much runtime does it actually add?
3600Wh, which is exactly the same as the DELTA Pro itself — so it doubles whatever you currently get. If your fridge, lights and devices run for 13 hours today, they'll run for around 26 with this attached.
Does it increase output power as well as runtime?
No. Output stays at 3600W continuous and 7200W surge, because that's set by the DELTA Pro's inverter rather than by how much battery is behind it. If you need to run more devices simultaneously rather than run them for longer, you want a second DELTA Pro with the Double Voltage Hub, not an extra battery.
Is installation complicated?
No. One cable connects the extra battery to the DELTA Pro's dedicated port, and the system does the rest. There's no configuration step and no need to power anything down. It sits alongside or beneath the main unit.
Can I add it to a system that's already set up?
Yes — that's the normal way people buy these. Plenty of customers start with a DELTA Pro and add a battery a year later when they've learned what their real runtime needs are.
How does it charge?
Through the DELTA Pro, using whatever inputs the main unit has available — wall power, solar, car, or the full 6500W MultiCharge. Both packs charge together. It can also be charged directly from an EcoFlow Smart Generator with no DELTA Pro attached.
How long will it last?
EcoFlow rates the LFP cells at 6,500 cycles to 50% capacity and 3,500 cycles to 80%, which is roughly ten years of daily cycling. It's the same chemistry and the same rating as the main unit.
How heavy is it, and can I move it?
About 84 lbs. It has handles and it's designed to be moved occasionally rather than carried around — for most people it lives permanently next to the DELTA Pro. If you'll be lifting it into a vehicle regularly, plan on two people.
What warranty does it come with?
EcoFlow's full 5-year warranty. We're an authorized dealer, so claims go through the normal EcoFlow process with our support behind them.
Do you offer financing or price matching?
Yes. We offer 0% APR financing options through Affirm at checkout, and our Lowest Price Guarantee applies — if you find this battery cheaper at another authorized dealer, call us at (303) 876-7654 before you order and we'll take care of it.
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