OnePlus may be evaluating a new mid-size performance-focused smartphone, according to a January 13 leak from trusted Weibo tipster @DigitalChatStation. The post mentions a “Jiajia” factory testing a 6.59-inch 1.5K LTPS flat display, widely believed to be for an upcoming OnePlus device, despite the brand not being named directly.

The display is described as having large, rounded corners and visually equal bezels on all four sides, continuing OnePlus’ recent move toward flat-screen designs. The panel is reportedly sourced from a domestic Chinese supplier, rather than Samsung. The phone is positioned as a “mid-screen performance phone,” suggesting a balance between usability and power rather than oversized dimensions.

Battery discussions tied to the leak indicate that a 6.59-inch form factor can support 8,000mAh-class batteries, while larger 6.78-inch phones struggle to scale as efficiently. This aligns with earlier reports of a OnePlus engineering prototype featuring a 6.78-inch 1.5K 165Hz LTPS flat screen and batteries starting in the 8,000mAh range, with internal targets reportedly reaching 9,000mAh.

If launched, this device could sit between the Nord and Ace series, targeting users who want strong performance and long battery life in a manageable size. The move also mirrors a wider trend, with brands like Redmi, iQOO, and Realme already pushing flat-screen performance phones with ultra-large batteries.

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