"Battery size is not always a straightforward comparison. The highest number of milliampere hours (mAh) doesn't always translate to the longest battery life. Indeed, "battery life" itself is somewhat subjective. A phone streaming a video saved to local memory will last longer than a phone exporting a 30-minute 4K video, and yet another phone streaming Spotify to a car on a road trip (with the screen off) will last longer than both."
"As you might have gleaned from that, the main things that will chew up your battery the fastest are the screen and the processor. The waters get muddied a bit further when you consider things like an AMOLED panel versus an LED screen. Suffice it to say, there are a lot of factors to negotiate. Also: I changed 7 settings on my Samsung phone for significantly improved battery life"
Total battery capacity is only one factor influencing real-world device longevity. Screen usage and processor activity cause the largest power draw, with differences between AMOLED and LED panels further affecting consumption. Usage scenarios such as local 4K playback, exporting high-resolution video, and streaming audio with the screen off produce markedly different runtimes. Comparative testing used local 4K video streaming and a PC Mark battery rundown to evaluate endurance. Devices compared included the OnePlus 15, OnePlus 15R, Samsung Galaxy S25 Ultra, and Google Pixel. Test results showed that larger mAh ratings do not guarantee the longest battery life and that efficiency and settings matter.
Read at ZDNET
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