OnePlus is reportedly gearing up to make a significant leap in battery capacity with its upcoming flagship, the OnePlus 15. According to a leak from well-known Chinese tipster Digital Chat Station, the new phone could come equipped with a huge 7,000mAh dual-cell battery — a substantial upgrade from the OnePlus 13’s already impressive 6,000mAh capacity.
This move would place the OnePlus 15 among the battery giants in the flagship market, outmatching notable competitors like the Samsung Galaxy S25 Ultra and the iPhone 16 Pro Max in sheer battery size. But interestingly, insiders say the battery could have been even larger, possibly 7,500mAh or even 8,000mAh. So why stop at 7,000mAh?
The answer lies in OnePlus’ focus on maintaining a sleek, thin design. Using advanced high-density silicon-carbon battery technology—the same used in the OnePlus 13—the company can fit a large battery into a thinner chassis. This delicate balance allows OnePlus to offer impressive battery life without making the phone bulky or heavy, a crucial selling point in today’s competitive smartphone market.
OnePlus flagships are also known for their fast charging capabilities, supporting up to 100W charging speeds. So, despite prioritizing thinness, the OnePlus 15 promises quick top-ups that complement its long-lasting battery.
This design philosophy aligns with current industry trends. Samsung, for instance, has embraced ultra-thin devices like the Galaxy S25 Edge and Galaxy Z Fold 7, while Apple is rumored to unveil a slim iPhone 17 Air model in its next lineup. OnePlus seems poised to compete in this “thin but powerful” category effectively.
Other rumored specs for the OnePlus 15 include the Snapdragon 8 Elite Gen 2 chipset and a potential IP68 or IP69 water and dust resistance rating, which would further solidify its flagship credentials.
While the official announcement is still months away, the battery upgrade alone makes the OnePlus 15 an exciting prospect. For users like me who prioritize battery life, the idea of a 7,000mAh battery combined with rapid charging in a slim form factor is a big win. It means less worry about running out of juice during the day and more time enjoying the phone’s features.
Ultimately, OnePlus’ choice to stop at 7,000mAh reflects a smart compromise: enough power to keep users happy while keeping the device sleek and competitive in a market increasingly obsessed with thinness.
