OnePlus has brilliantly designed the OnePlus Open, its first foray into foldable phones. With its razor-thin profile and lightweight packaging, it is almost unbelievable to comprehend the fact that this is a first-generation model.

So it makes sense to wonder if OnePlus had to cut back on the battery to achieve its impressive design. The short answer to that is no. The short answer to that is no, because foldable handsets are not very durable. However, it seems that the battery life of foldable phones continues to improve with each new generation, and the OnePlus Open is one example.

Rival models like Samsung's Galaxy Z Fold 5 benefit from years of R&D by past models, and newer models like the Pixel Fold show how chipset power efficiency can make a difference In the OnePlus Open review, We ran a custom battery benchmark test to see exactly how long it takes for the battery to run out and how fast it charges using the included charger. [The results were astounding and part of the reason the OnePlus Open is the best folding phone out there.

We ran each model through Tom's Guide's battery test, which included 5G of continuous web surfing at a screen brightness of 150 nits.

To obtain a reliable rating, we run this test several times, and based on the results we obtain an average time. These tests are performed at the phone's default refresh rate and standard 60 Hz. Higher refresh rates generally result in higher loads

On the OnePlus Open, we used the included 80W SUPERVOOC power adapter.

When performing this recharge test, the phone is typically drained and then marked how charged it is after 15 and 30 minutes.

Since this is OnePlus' first foldable phone, we compare it to its most direct competitors, the Samsung Galaxy Z Fold 5 and the Google Pixel Fold. Both have a book-shaped design similar to the OnePlus Open.

OnePlus has managed to put a massive 4,805 mAh in a foldable phone. This is a step ahead of those found in the Pixel Fold and Galaxy Z Fold 5, which have 4,355 mAh and 4,400 mAh batteries, respectively. This puts the OnePlus Open ahead of its rivals in the battery life department.

In fact, the 11 hours and 45 minutes is better than the 11 minutes and 25 seconds recorded by the Galaxy Z Fold 5, which previously held the title of longest battery life on a foldable phone. Furthermore, the OnePlus Open outperformed the Pixel Fold by nearly two hours in the same test.

This is also true for actual daily use of these foldable phones: on most nights since we began testing the OnePlus Open, the battery life before bedtime has consistently been around 10%. This may not seem like a big deal, especially when you see traditional flagship slates at around 15%, but for a folding phone it's a great step in the right direction.

Even more surprising is the OnePlus One's fast charging time. As you can see from the graph above, they are not at all close. Using the included 80W SUPERVOOC power adapter, the OnePlus Open's 67W wired charge via USB-C can be charged to 50% in 15 minutes and is almost fully charged at 85% after 30 minutes.

By contrast, the Pixel Fold and Galaxy Z Fold 5 are much slower. However, it should be noted that these foldable phones also have the convenience of wireless charging, which is not available on the OnePlus Open.

Battery life has long been one of OnePlus' strongest areas, so it is not surprising that it excels on the OnePlus Open. Larger batteries tend to mean larger designs, and OnePlus has managed to strike the right balance. But OnePlus still managed to design a folding phone that is razor thin and lighter than everything else out there.

We still wish the OnePlus Open had wireless charging. But wireless charging is one of those features we hope to see on premium-priced smartphones.

Be that as it may, you won't be disappointed with its battery life.