Connects the DELTA Pro 3 to its Extra Battery via the rear port, offering reliable power transfer.
| Length (2.8ft) | 0.85m |
| Length (6.56ft) | 2m |
| Compatibility | DELTA Pro 3 Extra Battery |
| Connector Type | Flat Link Cable |
| Material | High‑quality cable |
EcoFlow DELTA Pro 3 Extra Battery Flat Link Cable
Reliable Power Transfer for Your DELTA Pro 3 Setup
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Price range: $78.95 through $113.95
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In the box
- 1x Flat Link Cable (selected length)
Reliable Power Transfer for Your DELTA Pro 3 Setup
This flat link cable connects your DELTA Pro 3 to its Extra Battery through the rear port, delivering consistent power transfer when you need it most. Built for field-tested reliability in off-grid setups where every connection matters. Available in two lengths — 2.8ft for tight installs or 6.56ft when your battery bank demands more reach. A high-quality cable engineered for grid-independent systems that can't afford a weak link.
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DELTA Pro 3 Compatible
Reliable Power Transfer
Flat Link Connector
Two Length Options
0.85m
Short Cable Length
2m
Long Cable Length
Rear Port
Connection Point
Purpose-Built for Your DELTA Pro 3 System
When you piece together off-grid components from different vendors, you run the risk of mismatched connectors and unreliable power transfer. A generic cable might physically fit but fail under load when you actually need it. This flat link cable is engineered specifically for the DELTA Pro 3 rear port connection to its Extra Battery — no guesswork, no compatibility questions. At Off Grid Vault, we only carry components we would use on our own setups, and that means the right cable for the right port, every time. Available in 2.8ft or 6.56ft lengths to match your installation layout.
Clean Installation, Consistent Power Flow
A flat link cable keeps your battery setup tidy compared to bulky round cables that clutter tight spaces. The low-profile design routes cleanly along walls, under mounts, or through compartments without kinking or creating trip hazards. High-quality cable material ensures minimal voltage drop during power transfer between your DELTA Pro 3 and Extra Battery, so every watt stored in that battery actually reaches your inverter when you need it. For off-grid systems where every bit of capacity matters, this cable helps you avoid the phantom losses that come with undersized or poorly constructed wiring.
Choose the Right Length for Your Layout
Two available lengths let you position your Extra Battery exactly where it fits your space — not where the cable forces it. The 2.8ft (0.85m) option works for stacked or side-by-side installations where the battery sits close to the DELTA Pro 3. The 6.56ft (2m) option gives you reach for shelf-mounted, under-counter, or separated layouts where distance matters. Either way, you get the same reliable flat link connection and consistent power transfer. Select the length that matches your actual setup rather than adapting your entire system around a cable that is too short or too long.
Compatibility Check
Confirm your setup matches these requirements before ordering.
- DELTA Pro 3 main unit equipped with rear expansion port
- DELTA Pro 3 Extra Battery module present in your system
- Selected cable length covers the distance between units
Where This Cable Fits
Purpose-built for DELTA Pro 3 battery expansion scenarios.
Homestead Battery Expansion
Cabin Power Backup Setup
Extended Off-Grid Runtime
Full specifications
At a glance
- Surface
- High‑quality cable
- Warranty
- See product page
Full specifications6 data points across 4 categories
Dimensions
| Length (Short) | 0.85m |
|---|---|
| Length (Long) | 2m |
Power & Performance
| Compatibility | DELTA Pro 3 Extra Battery |
|---|---|
| Connector Type | Flat Link Cable |
Materials
| Material | High‑quality cable |
|---|
Compliance & Warranty
| Warranty | See product page |
|---|
The Off Grid Vault Promise
Every product we carry is vetted for real-world performance. If it doesn't meet our standards, it doesn't make the cut.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free ShippingShips free to your door — no minimums, no thresholds, no surprise freight charges.
Vetted Products OnlyWe curate equipment with verified build quality and real track records. No fluff, no guesswork.
★★★★★
“Picked up the 6.56ft cable to connect my DELTA Pro 3 to the Extra Battery I keep under the workbench in my shop. Clean fit, no drama, just plugged it in and both units recognized each other immediately. Much better than trying to rig something together.”
Additional information
| OPTION | Extra Battery Flat Link Cable (2.8ft / 0.85m), Extra Battery Flat Link Cable (6.56ft / 2m) |
|---|
Frequently Asked Questions
Generic cables may fit physically but can introduce voltage drop, connection instability, or even safety risks under sustained load. This flat link cable is built specifically for the DELTA Pro 3 rear port and its Extra Battery. At Off Grid Vault, we only stock components we would trust in our own off-grid setups — not random parts that happen to fit.
If your Extra Battery sits directly next to or stacked with your DELTA Pro 3, the 2.8ft cable handles it. If your battery is mounted separately — on a shelf, under a counter, or across a compartment — go with the 6.56ft option. Pick the length that fits your layout rather than forcing your system around a cable.
This flat link cable is designed specifically for the DELTA Pro 3 Extra Battery connector. It is not intended for use with third-party battery banks or other brands. If you are building a mixed-brand system, reach out to our team — we can help you identify the correct interconnect cable for your configuration.
A failed connection at the wrong moment — during an outage, on a remote job site, or at your cabin — costs far more than the cable itself. This is a purpose-built component with the correct connector, gauge, and shielding for sustained power transfer between your DELTA Pro 3 and Extra Battery. You are paying for reliability, not a generic wire.
Off Grid Vault offers a 30-day performance guarantee. If the cable does not perform as specified with your DELTA Pro 3 and Extra Battery, return it uninstalled and in original packaging for a full refund. We stand behind every component we sell because we only carry products we would install on our own systems.
This cable ships free on all orders, with no minimum purchase required. Standard processing and shipping times apply based on your location. If you need it urgently for an upcoming build or backup setup, contact our team before ordering and we will confirm the current lead time. No surprise freight charges — free shipping is unconditional on every product we sell.
The Off Grid Vault Promise
Every product we carry is vetted for real-world performance. If it doesn't meet our standards, it doesn't make the cut.
30-Day Performance Guarantee
If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free Shipping
Ships free to your door — no minimums, no thresholds, no surprise freight charges.
Vetted Products Only
We curate equipment with verified build quality and real track records. No fluff, no guesswork.
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About ecoflow Battery Accessories
ecoflow is a trusted manufacturer of premium battery accessories. OffGridVault is an authorized dealer offering the full ecoflow lineup with free delivery, price match guarantee, and expert support.
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