EcoFlow Delta 2 1024Wh Smart Extra Battery Review

The EcoFlow Delta 2 is already a robust and reliable power backup solution but it has the potential to be even better. This is thanks to the EcoFlow Delta 2 ‘s 1024Wh Smart Extra Battery which is basically the same battery cell found in the main unit but as an additional add-on to the setup. In turn, it takes your Delta 2’s 1024Wh capacity and doubles it to 2048Wh. It is as simple as that.

Before I get into the details of this extra battery, be sure to check out my full review of the Delta 2 here. You’ll get a good understanding of the unit’s full potential without this double capacity and how well it functions.

There isn’t much to the EcoFlow Delta 2 1024Wh Smart Extra Battery. You get the battery itself, some instruction manuals and one thick cable. The cable is stored in a neat compartment on the top of the battery which can be used to store the same cable or other things when you’re carrying the battery around.

When it comes to the design of the EcoFlow Delta 2 1024Wh Smart Extra Battery, it is almost identical to the Delta 2. Of course, it doesn’t have all the ports and buttons. Instead, it is empty on the back end and has one button on the front. This button turns the display, which is also identical to the main Delta 2.

While the extra battery is the same size as the Delta 2, I was surprised to see just how little space the battery cells take in the box itself. The storage compartment is pretty large which goes to show how much tech has been removed from this unit just to install the batteries. Essentially, it is an empty shell with only a few batteries inside of it and it is a marvel in technology.

Now both the Delta 2 and the Delta 2 extra battery both have a sealed flap on the right-hand side of the unit. This flap is where the thick cable goes which tethers the units together. And that’s about it.

Believe it or not but setting up this extra battery is just that simple. I didn’t even have to do anything on the app either. Once I connected the cable, the app automatically detected the battery and provided its charge and battery life on the home page.

Now once these two devices are tethered together, they piggyback off of each other across everything they do. I originally thought that the main Delta 2 unit would drain first and then take power from the Smart Exttra Battery but that isn’t actually the case. Both units share the load accordingly. If you are using 100W, they both provide power at the same time.

This power isn’t divided equally in half though. Say your draw is 100W, the Smart Extra Battery would deliver 70W and the main unit the remaining 30W. It isn’t always stable which is also impressive considering how this unit can maintain a stable output with two batteries delivering various loads at once.

The same goes for charging. Power is sent to the Delta 2 and distributed to the Smart Extra Battery at the same time. There isn’t a case of recharging the main unit and then switching over to the Extra Battery.

There’s also good news for those who don’t like the fan noise on the Delta 2. With the Smart Extra Battery plugged in, the threshold wattage which turns off the fan is also much higher. Usually, on the Delta 2 without the battery connected, the fan would turn on at under 70W at 21C. However, with the Smart Extra Battery connected, the fans turned off at 90W.

This is likely due to the load being shared across both units so they don’t require the fan due to both batteries only producing around 60W and 30W of the 90W. It isn’t a big deal but I really enjoyed having the silence at night when my electric blanket was drawing 80W of power and the fans weren’t whirling as a result. Usually, I would have to lower the electric blanket level down to 1 of 3 in order to turn the fan off on the standalone Delta.

I know this doesn’t really matter but I thought it was a cool thing to share. There’s actually a lot more to the Delta 2 Smart Extra Battery than just a simply extended battery.

Of course, the test results show the power of this unit is definitely worth the upgrade. It doubles whatever time you’ll get with the Delta 2 which in my situation meant four hours of 75-inch gaming with the PS5 and Xbox Series X.

General TV watching on a 75-inch model lasts seven hours and enabling an eco mode on the TV takes this past 20 hours. It is pretty impressive. Other household tests which didn’t go so well on the River 2 Max such as the kettle and microwave are a dream on the Delta 2 and Extra Smart Battery too. A kettle can be boiled about four to six times on a single charge. The microwave also worked just fine. Its life span all depends on your power mode.

The Delta 2 Smart Extra Battery benefits from the same perks as the main unit so you can X-Boost the power to 2700W and it supports 1800W general output. It also charges just as quickly and both batteries, when completely depleted, can charge to the max in just under three hours.

I also got to test the Delta 2 and Smart Extra Battery using the EcoFlow 220W Bifacial Solar Panel. It would take about 13 – 15 hours to fully charge both of these units. Definitely not the best solution here. You would want to go with a 400W or higher solar panel in this case.

Where the Delta 2 was already quite capable, the Smart Extra Battery takes things to a whole new level. With this battery, everything becomes more capable and there’s definitely a sense of ease knowing it is around. For example, I can now play games and watch TV with my full sound system connected because I have that power. I can now boil the kettle if I really have to because I have that extra power.

It might be an extension but this battery is a plug-in-and-forget addition which does a lot more than you think. If anyone is looking to extend their backup a bit more, this does the job.