OnePlus 15 Aims to Offer Massive Battery in a Thin Body

In the race to build the ultimate flagship smartphone, companies are constantly making trade-offs between features, performance, and design. This year’s devices, like the Galaxy S25 Edge and the upcoming iPhone 17 Air, reflect a bet on thinness while compromising aspects such as the camera and battery. Even so, new technologies allow for sacrifices without having a significant impact on the user. The upcoming OnePlus 15 could be an example of this, as it could offer a massive battery capacity while maintaining a sleek design.

OnePlus 15 may offer the full pack of battery capacity and thinness

According to a new report from the reliable Chinese tipster Digital Chat Station, OnePlus is currently testing a new flagship phone—widely believed to be the OnePlus 15—with a whopping 7,000mAh dual-cell battery. This is an impressive number that would place the phone’s power capacity among the best in the industry. OnePlus is probably using high-density silicon-carbon technology for the battery. This is the same advanced tech we’ve seen even in OnePlus flagship devices—like the OnePlus 13. It allows for a thinner battery that still holds a lot of power.

But the latest Digital Chat Station leak (via nakajimegame) talks about something even more interesting. The post on Weibo suggests that OnePlus actually has the capability to go even bigger—to 7,500mAh or even 8,000mAh. However, the company is reportedly choosing to cap the capacity at 7,000mAh to ensure the OnePlus 15 can remain a relatively thin device. Plus, the battery could be compatible with 100W ultra-fast charging via USB-C and 50W wireless.

This design philosophy is likely a response to a growing trend in the premium smartphone market. Brands like Samsung—and soon Apple—are setting a new standard for incredibly thin and elegant devices. This year’s Galaxy Z Fold 7 and Galaxy S25 Edge are a clear example of this. For a company like OnePlus, which sells its flagship phones in competitive markets like the United States, it’s crucial to make a device that doesn’t look too bulky next to its mainstream rivals.

Powerful chip and flagship durability

The OnePlus 15 is still months away from its official announcement. However, the latest leak helps piece together the puzzle about the device. We can also expect the handset to be a performance powerhouse, as previous rumors have suggested it will be powered by a Snapdragon 8 Gen 2 chip and will feature a solid IP68/IP69 rating for durability.

If these leaks hold true, the OnePlus 15 is shaping up to be a really attractive flagship alternative. The company would seek to achieve the ideal balance between battery life, charging speed, and premium design.