As smartphone specs trends slow down, a new trend is emerging: big battery phones.
In 2025, large-capacity battery phones have appeared more and more, including leading Chinese brands such as Oppo and Xiaomi. These products not only have the same design as regular flagships, but also have batteries up to 7,500 mAh. This is 50% larger than the iPhone 17 Pro Max and Galaxy S25 Ultra.
Despite having a large 7,500 mAh battery, the Oppo Find X9 Pro doesn't feel too bulky.
Despite having a large 7,500 mAh battery, the Oppo Find X9 Pro doesn't feel too bulky.
Actual test results show that the Oppo Find X9 Pro can maintain web browsing time up to 25 hours, 25% higher than its competitors. For YouTube video streaming, the Oppo's usage time is almost 45% higher. This shows that, although not always proportional, the improvement in battery life is significant.
This change brings a new experience: “big battery phones” can be used continuously for two days without needing to be charged. This means users no longer have to worry about charging overnight or carrying a charger when traveling. Even with light use, the usage time can be extended to three days.
Phone
Browsing the web
Video Play games
OPPO Find X9 Pro (7,500 mAh)
25 hours 34 minutes
13:30
11:17
iPhone 17 Pro Max (5,088 mAh)
20 hours 9 minutes
9 hours 37 minutes
11:34
Galaxy S25 Ultra (5,000 mAh)
20:49
8 hours 54 minutes
14 hours 21 minutes
Google Pixel 10 Pro XL (5,200 mAh)
19:41
10 hours 0 minutes
4 hours 35 minutes
Apple and Samsung are vulnerable
With camera quality no longer the deciding factor for users to upgrade, battery life will become an important highlight. Despite their large financial potential, Apple and Samsung have been slow to improve battery technology. Advances in battery technology such as stacked battery cells and AI-based power management have helped integrate more power without increasing the size of the phone.
Apple and Samsung are currently facing pressure from Chinese brands, which are leading the way in battery technology innovation. Although these brands are limited in many markets, the pressure from consumers will only increase.
Consumers are starting to care more about "how many days the phone battery can be used".
Consumers are starting to care more about "how many days the phone battery can be used".
When users see phones like OnePlus or Xiaomi with outstanding battery life and fast charging times, they wonder why Apple and Samsung products can't do the same.
Competition in the mobile technology industry is fierce, and if they don't innovate quickly, Apple and Samsung could fall behind in the race.