The Microsoft Surface Duo is expected to launch this month, and when it arrives, it could have the best battery life ever for a folding device.

Despite the 3,460 mAh battery and Snapdragon 855 chip that will be available starting in 2019, Windows Central says Microsoft's tablet-meets-phone will have enough electrical endurance to get through a day of use and reportedly.

This information does not tell us exactly how long the Surface Duo will last. However, given that the Surface Duo uses a smaller battery size than the Galaxy S20 Ultra's 5,000 mAh pack, still runs two displays, and has an older chipset, a day's worth of battery power is worth noting.

Additionally, the Galaxy Fold only lasted 10 hours and 1 minute on its 4,380 mAh battery. This is interesting given the Duo's larger total screen area of 11.2 inches compared to the Fold's 7.3-inch main display.

The Galaxy Z Fold 2 is expected to have a 4,365 mAh battery and a 7.7" internal display with a 120 Hz refresh rate. We don't expect it to beat the Surface Duo in battery life based on these specs, but we'll have to see how the two devices hold up in the real world.

These are the rumored Surface Duo specs; it is quite possible that Microsoft has done a lot on the internal hardware front to make the device more efficient since its October 2019 announcement. It is also possible that the Surface Duo will even use a newer Snapdragon chip, such as the Snapdragon 865.

Part of the Surface Duo's battery life could be attributed to the fact that the two screens do not have a display with a high refresh rate of 60 Hz. Also, the lack of 5G connectivity means that the foldable gadget consumes less power when connecting to cellular broadband, which is not the fastest connection available.

Nevertheless, for a device that uses a heavily modified version of Android to deliver a Windows 10-like experience, the all-day battery life will be a boon for those who plan to use the Duo as a productivity machine. With support for Office apps and an improved Surface Pen, the Surface Duo is likely to be a strong partner device when the Microsoft Surface Pro 8 and Microsoft Surface Laptop 4 arrive around October.

Other rumored specs for the Surface Duo include 6GB of RAM, storage in 64GB, 128GB, and 256GB variants, one USB-C port and nanoSIM slot, and an 11MP camera.

Both the Surface duo and the Galaxy Z Fold 2 are said to launch this month, and we could be in for a big showdown between two of the most promising foldable phones yet.