Oppo’s Find X9 Pro has been enjoying its moment in the spotlight thanks to that enormous 7,500 mAh battery and the multi-day endurance that comes with it. But Vivo might not let Oppo hold the crown for long. A fresh leak suggests the upcoming Vivo X300 Ultra is gearing up to challenge — or at least come close to — that record-breaking number.
The info comes from reliable Weibo leaker Smart Pikachu, who claims Vivo is planning a Q1 2026 launch for the phone. Digital Chat Station, another well-known tipster, previously pointed to a March 2026 release window, which lines up almost perfectly with Vivo’s usual flagship schedule. In short, development seems well underway.
The battery is the big hook here. Vivo has already been steadily pushing capacity upward. The X200 Ultra launched globally with a 6,000 mAh silicon-carbon cell. Then came the X300 series, where the standard model sits at 6,040 mAh and the X300 Pro climbs to 6,510 mAh. Now, the X300 Ultra is rumored to jump to roughly 7,000 mAh.
While that’s another major leap — and enough to pose a real threat to the Find X9 Pro (7500 mAh) or the Xiaomi 17 Pro Max (7500 mAh) — it’ll be interesting to see whether the upcoming Find X9 Ultra pushes things further toward an 8,000 mAh milestone. The Find X9 Ultra was, in fact, rumored to feature the largest battery among all upcoming “Ultra” phones.
Other specs of the X300 Ultra remain mostly behind the curtain for now, though the phone is expected to feature Qualcomm’s upcoming Snapdragon 8 Elite Gen 5 chip and a new camera setup built around a 35 mm primary lens paired with Sony’s latest Lytia 901 sensor. One more welcome change? Unlike the China-only X200 Ultra, this model is reportedly heading for a global release from day one.
If all of this holds true, the X300 Ultra could become one of the most-watched flagships of early 2026.
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