The OnePlus 15 is a good phone made great by its stupendously good battery life. Its display, build and cameras are all above average, but it's the longevity afforded by the 7,300mAh silicon-carbon cell that elevates this phone.
Using a device whose battery can last three days completely changed how I approached charging it, while also ruining other phones for me.
As a reviewer, I am lucky enough to have a few handsets to switch between at any given time. After a couple of weeks of using the OnePlus 15, I found its battery life so good that moving back to another phone feels pointless. Why would I want to use a smartphone I have to charge every day?
As I write this, it's 11:35am on Wednesday. The OnePlus 15 has 43 percent battery. I took it off the charger with 100 percent at 8am on Monday. That means it lasted 51 and a half hours and only used 57 percent of its charge.
That is astounding. Granted, I am not the heaviest phone user, but after a normal day of use, my iPhone 16 is begging to be plugged in, often hitting 20-30 percent after just 12 hours of use by 8pm.
Even the 5,000mAh battery in the Samsung Galaxy S25 Ultra is nothing to write home about compared to the OnePlus 15's. It might just stretch to two days, but Samsung's phone also depletes considerably overnight.