I did several battery-drain tests on the Droid Razr Maxx HD. First, I simulated a continuous voice call with Wi-Fi on, allowing the screen to time out after 30 seconds, and the smartphone offered 22 hours of talk time — an hour short of Motorola’s claims, but still impressive.
By comparison, Apple’s estimate for the iPhone 5 is up to eight hours of talk time, while the Samsung Galaxy S III is estimated at up to 17 hours.
In another test, I played a loop of video that I downloaded from the Google Play store. With the screen brightness set at 75 percent, and with Wi-Fi on and email running in the background, the Droid Razr Maxx HD lasted 13 hours before displaying a “low battery” alert.
Of course, those tests don’t really simulate how we use smartphones in the real world, so I also kept note of battery life during day-to-day use. With moderate use — checking email and social networks, listening to music, browsing several Web sites and streaming a couple of YouTube videos over Verizon’s 4G LTE network, I was able to go about a day and a half before I needed to recharge. Meanwhile, my colleague Walt Mossberg got between nine and 12 hours of battery life from the iPhone 5 with mixed use.
To see how it would hold up, I also added more power-hungry tasks, such as GPS navigation, playing games and streaming longer videos, and the smartphone was able to hang in for almost 24 hours. When I use similar apps on my iPhone 4, I’m usually scrambling for my charger after about eight hours or less.