"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."
"Also: I changed 7 settings on my Samsung phone for significantly improved battery life So when OnePlus launched the with a 7,400mAh battery and noted that it's the largest battery in a phone you can buy in the US, we took notice. Then we said, "Prove it." We decided to put that battery size to the test in two different ways. First, we conducted a local 4K video streaming test, and then we performed a battery rundown test using PC Mark. Both sets of results were surprising in different ways."
Total battery capacity is only one factor influencing actual device longevity. Lab tests demonstrate how different hardware components impact power consumption rates. The screen and processor are identified as the main consumers of battery power, and display type choices such as AMOLED versus LED further affect drain. Real-world usage scenarios vary battery outcomes, with tasks like local video playback, high-resolution video exporting, and audio streaming producing different runtimes. Comparative testing included OnePlus 15, OnePlus 15R, Samsung Galaxy S25 Ultra, and Google Pixel 1 using local 4K streaming and PC Mark battery rundown benchmarks. Results showed larger mAh ratings did not always yield the longest runtimes.
Read at ZDNET
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