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This item is eligible for return within 30 days of receipt
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Availability:
Only 10 left in stock, order soon!
Arrives
Monday, Aug 31
Style: DELTA Pro Extra Battery
Features
- Expandable Capacity. With a extra battery, DELTA Pro can expand capacity from 3.6kWh to 7.2kWh for battery backup power supply. Thatll give you days of power for your essential appliances.
- Charge Anytime, Anywhere. DELTA Pros extra battery benefits from all the charging methods DELTA Pro has, including 6500W MultiCharge. That means you can charge anytime, anywhere as long as your extra battery is connected to DELTA Pro. Once connected, theyll charge/discharge in unison, keeping the battery percent level across both units.
- Ready for Any Emergency. When the going gets tough and youre out of charge options, get a 1800W DC fast charge with EcoFlow Smart Generator (sold separately). Just plug the generator directly into your extra battery via the port on the back. This works even when disconnected from your DELTA Pro.
- Stay Informed. The extra battery sports a bright LCD screen on the front of the unit giving you all the info you need. Output, input, remaining charge and time remaining. Its all there. Need on the go info? The EcoFlow app can tell you all that & a whole lot more.
- Smart Control. DELTA Pros extra battery can be monitored from the EcoFlow app, allowing you to monitor & control your batteries from afar.
Description
DELTA Pro 2DP+Double Voltage Hub Dual Fuel Generator DP+Dual Fuel Generator DELTA Pro+400W DELTA Pro+2x400W DELTA Pro+3x400W
Brand: EF ECOFLOW
Wattage: 3600 watts
Fuel Type: Battery Powered
Power Source: Battery Powered
Recommended Uses For Product: outdoor
Item Weight: 105 pounds
Voltage: 120 volts
Output Wattage: 3000
Special Feature: Plug&Play home backup solution, clean and safe power, long-lasting LFP battery
Included Components: Extra Battery, Charge Cable, Hand Cover, User Manual
Wattage: 3600 watts
Fuel Type: Battery Powered
Power Source: Battery Powered
Recommended Uses For Product: outdoor
Voltage: 120 volts
Output Wattage: 3000
Additional Features: Plug&Play home backup solution, clean and safe power, long-lasting LFP battery
Engine Type: 4 Stroke
Total Power Outlets: 6
Starting Wattage: 3600 watts
Frequency: 50 hertz
Runtime: 24 hours
Item Weight: 105 pounds
Item Dimensions L x W x H: 25"L x 11.2"W x 16.4"H
Color: Black
Brand Name: EF ECOFLOW
Included Components: Extra Battery, Charge Cable, Hand Cover, User Manual
Model Name: EFD500-EB
Model Number: EFD500
Number of Items: 1
UPC: 842783147097
Unit Count: 1 Count
Manufacturer: ECOFLOW
Item Type Name: power-generators
Manufacturer Part Number: EFD500
Warranty Description: 5 year warranty
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Aug 31
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Style: DELTA Pro Extra Battery
I absolutely love these EcoFlow units. This Delta Pro Extra Battery is no exception. I own several EcoFlow products, and they’ve consistently been at the top of my list compared to other brands I’ve tried. This extra battery connects to the Delta Pro easily. It is heavy, so you may want someone to help you move it, but the wheels make rolling it into place simple. It comes with a very solid, thick connection cable that attaches securely to the Delta Pro. The extra battery has given me a huge boost in runtime. We use our Delta Pro as part of a backup system with a transfer switch, and adding this battery has made everything work even better—especially during outages and peak-hour usage. We already have solar on the house, so pairing that with EcoFlow has actually helped us reverse our electric bill. Pretty amazing. One of my favorite things about EcoFlow is their app. It’s smart, reliable, and shows exactly how long you have left on your battery, how long it will take to charge, and the wattage each device is pulling. I also love that you can use third-party smart plugs in the EcoFlow app; I use Tapo plugs and they work great. You can set timers and manage everything right from your phone. Charging flexibility is another big win. Whether I plug it into a standard outlet or charge it through solar, it’s quick and efficient. I personally charge mine at a lower wattage, but it’s capable of charging much faster if needed. EcoFlow always has great deals, excellent customer support, and a dependable honor system. This extra battery was a must-have add-on for my home setup, and I’m thrilled with how much more power and freedom it gives me. A fantastic upgrade.
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Reviewed in the United States on November 29, 2025 by Living Life
Style: DELTA Pro Extra Battery
Excellent product. The quality exceeded my expectations and it works exactly as described. The materials feel sturdy and durable, and it is very useful for everyday use. It arrived in perfect condition and was easy to use right away. I would definitely buy it again and highly recommend it to anyone looking for a reliable, high-quality product.
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Reviewed in the United States on June 18, 2026 by Emelin Leyva
Style: DELTA Pro Extra Battery
FANTASIC! Easy to set up, plug & play. Reminder to store both the main unit and extra battery in a cool dark room. Keep ours in spare room next to window w window fan. They are sensitive to temps. Been using now for one year. Couple of power outages. Used for lights, cell phones, fans, and for our 1k portable AC in middle of Cali hot/dry summer when power went out as it always does around 4pm. Will run that AC for about 6 hrs on low and fully drains both the main and spare. In winter use for 200-watt Lasko mini heater, bathroom heater, heating pad and of course if power out. Have not used for fridge/chest freezer just yet, if outage more than 3-4 hrs will need to. Saving to get one more battery and one more bifacial glass panel. The folding portable that came with the main unit still works great in combo with the bifacial. For cleaning i hook up an RV water filter to hose, use the full or soaker setting-nothing else. Do not need a permit or electrician to tie these to the grid, nothing special just hook it all up, get the angle on the panels and boom start generating power! Be mindful that these types of batteries if not hooked up correctly or overheat and start a fire.
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Reviewed in the United States on October 31, 2025 by CarolynSJ
Style: DELTA Pro Extra Battery
We ordered a pair of the extra battery packs on the Fall prime day as we saved $400 on the prices we had been watching for a while. We've been using our ecoflo delta pro in a solo configuration for about a year with about 1550 watts of solar panels in our bedroom powering pretty much everything. No problems and the unit didn't break a sweat. The extra batteries provide a significant amount of power that will be most useful next Summer in the Texas heat when we have some plans for heavier loads. On arrival I found that one of the units reported errors but as it turned out, I had never updated the firmware on the delta pro and that was the cause. The units worked fine without the update in spite of one of the batteries reporting phantom errors. Ecoflow replaced one of the batteries before we realized what was going on. They covered the shipping. My only real concern is that if there ever is a hardware issue, its going to be expensive to ship back to California. In fact, any one of the items, whether it be a battery unit or the delta pro items, would likely be $200-300 for ground shipping so FYI but these are great units and I have no reason to think that I will have a problem that requires a trip home. Support was great and after an initial phone call, troubleshooting was handled by email. Emails came at overnight hours in the US so I presume support was outside of the US. Not a problem for me at this point.
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Reviewed in the United States on November 13, 2023 by John D Langridge
Style: DELTA Pro Extra Battery
Excellent
Reviewed in the United States on August 16, 2026 by Andy
Style: DELTA Pro Extra Battery
Not much to say as it's pretty obvious what this does: increases runtime quite a bit. If you are going to be away from a power source for a long time, simply charge up the Delta Pro with one of these attached. The build quality is great, there's a door on the top to stow the cable which is a nice touch. While not specific to the external battery, their app must be mentioned in every review, in my opinion. I'm an Android user and I find that most companies will focus more efforts on their iOS app; Android being "the red headed step child". That is NOT the case with EcoFlow. I can't speak to the iOS app, but their Android app is absolutely top notch. I would go so far as to say it's in the top 5 apps, as far as user experience goes, that I've ever used. The extra batteries do have a little bit to be desired, however. 1. It'd be nice if they added some non-proprietary power out on these. If I need to grab a power device and go, I have to take the Delta Pro as there aren't any usable outlets on the extra battery, which leaves any remaining extra batteries not charging or discharging. 2. It'd be nice if they added a way to charge the extra batteries directly rather than relying on the Delta Pro. Break: I realize both of these things sound like I'm asking them to turn them into a Delta Pro. To be clear, I'd like to see EITHER of these things, not necessarily both. And both of these would likely cause some issue with the battery balancing, but from what I've seen, they have the tech to balance everything out. Essentially, if you have 2 extra batteries and your Delta Pro dies for whatever reason, the extra batteries become worthless until you replace your dead Delta Pro; dead meaning hardware failure 3. This bit is probably more of a Delta Pro thing than an extra battery thing, but the fact that you can only upgrade firmware via one port is a bit annoying. I'm not sure why this is the case 4. If 1 & 2 won't be done, I don't see the need for an LCD screen on the extra battery. It does have good info on it, similar to that of the Delta Pro, but you still have the Delta Pro screen and the app for informational purposes. I don't know how much this contributes to the BOM, but I generally don't view it as an absolute necessity 5. Not sure how they'd pull this one off but these cables are BEEFY. Makes sense as they're capable of 1800W so at 120V, that's 15A. However, the cables quite literally dictate the location of all things attached. 2 batteries? Delta Pro in the middle flanked by the extra batteries. I'd like to see an option for a smaller gauge cable and that would limit the charging wattage as needed. Longer cable options would be nice as well, again with limiting the charging wattage as you'll have voltage drop the longer the cable drops. All units have heat exhaust fans that, when looking at the front of the unit, exhaust out the right side. So the required configuration means that 2 of your 3 units are exhausting heat towards each other. It's just limiting overall. Longer and/or more flexible cables would allow more flexibility 6. This is the big one. Why not put another connection on the back like the Delta Pro? You can add another battery and just keep daisy-chaining the batteries for (theoretically) unlimited runtime. Not that your average person would need that, but why not? Overall, these are pretty expensive, still less expensive than the Delta Pro, but I think adding a little bit more usefulness in them would be a good idea as they are 100% reliant on a functioning Delta Pro.
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Reviewed in the United States on April 7, 2023 by Matt B
Style: DELTA Pro Extra Battery
Great capacity and performance. The extra 3600Wh significantly extends the DELTA Pro runtime, making it ideal for power outages, camping, or RV use. Solid build quality and easy to connect. The only downside is that it’s heavy and expensive, but it’s worth it.
Reviewed in the United States on May 23, 2026 by Yadary Pérez
Style: DELTA Pro Extra Battery
Works well with my EcoFlow Delta Pro. After hooking up to the EDP, I charged it to 100%, then shut both down, waited 30 minutes. Started the EDP2 and held the power button for 20-30 seconds, then both were balanced. The only downside to the EDP2 is that you can only use 2 EBs and only 1600-watt solar.
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Reviewed in the United States on March 1, 2026 by jet1959mo