Lenovo ThinkPad X1 Carbon 2014, A Fantastic Revision

Battery Life And Acoustics

There’s an 8-cell battery in the new Lenovo ThinkPad X1 Carbon, and we tested the system against the others in our database to see how much uptime the machine would offer before its battery gave up the ghost.  We've tested the machine in what could be considered  "worst case" and "best case" scenarios in the following two metrics.

Battery Eater Pro And Web Browsing Battery Life Tests
Power Consumption And Battery Life Tests
In an attempt to quantitatively measure the ThinkPad X1 Carbon's battery life in a controlled benchmark environment, we ran Battery Eater Pro. This test is designed to tax a laptop’s resources to give a feel for how long the laptop’s battery will last under heavy use. For the test, we set the ThinkPad's display to 50% brightness and enabled Wi-Fi.

In our Battery Eater Pro torture test, the ThinkPad X1 Carbon was  only able to eek out about 2 hours of uptime, which is not unusual for an ultralight machine.  In fact, it was about middle of the pack in this test, which exercises the CPU, Memory and HDD continuously until the battery gives out.

Our web browsing test measures the machine's ability to maintain power under light duty use with its WiFi radio on and the display set to 50 percent brightness with keyboard backlighting turned off.  This test refreshes a dedicated web page every couple of minutes and the page has a mixture of text, images, and Adobe Flash media.   We consider this to be a "best case scenario" and a decent relative gauge for battery life versus competitive products in a given device class.

The numbers say it all here.  Lenovo claims the new ThinkPad X1 Carbon will last 9 hours on a single charge under standard usage.  We realized just 24 minutes shy of that claim in our testing.

A Note On Noise (Or Lack Thereof) -

It should come as no surprise that the ThinkPad X1 Carbon is a relatively quiet machine.  Ultrabooks are designed to meet certain criteria in this regard as well, though frankly an ultralight like this has to almost defy the laws of physics, at least thermally, due to its super thin low-profile form factor.  Regardless, even under the heavy workloads of game testing or under the duress of our Cinebench professional graphics rendering test, the new ThinkPad X1 Carbon makes only the slightest of whir.  You do hear the fans spin up but the machine definitely maintains as low of a profile acoustically, as it does physically.

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