"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."
"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. Here's what happened."
"To start, we chose the phones we wanted to test. In the US, there are only a few manufacturers to choose from -- Samsung, Google, Motorola, Apple, and OnePlus. I don't have the largest offerings from Apple or Motorola (and testing a flip phone against the OnePlus 15R wouldn't yield much useful information), so I limited my test phones to the OnePlus 15, OnePlus 15R, Samsung Galaxy S25 Ultra, and the Google Pixel 1"
Battery capacity alone does not determine phone runtime; actual longevity depends on use case, hardware, and settings. Screen activity and the processor are the largest drains, while display technology (AMOLED versus LED) and background tasks also affect consumption. A 7,400mAh battery claim prompted comparative testing that included a local 4K video streaming run and a PC Mark battery rundown. Testing compared OnePlus 15, OnePlus 15R, Samsung Galaxy S25 Ultra, and Google Pixel 1. Test results produced surprising differences and demonstrated that higher mAh does not always yield the longest real-world battery life.
Read at ZDNET
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