SmartAboutThings writes "The original Surface Pro didn't have quite a good battery life and that's why Microsoft tried to fix this with the Surface Pro. After the Surface Pro 2 has hit general availability, Microsoft has silently pushed out a firmware update which, according to some new battery benchmarks run by Anandtech, made significant improvements to the battery life of the Surface Pro 2. After the new web browsing battery life test it was discovered that the Surface Pro 2 now manages better battery life than the ARM Surface 2, which is pretty impressive. With the firmware update, Microsoft was targeting over 8 hours, and AnadTech's benchmarks show Microsoft has succeeded, registering a 25% increase in battery life over the no-firmware version. The unpatched Surface Pro 2 lasted for 6.68 hours while with the firmware update installed, its battery life increased to 8.33 hours. The video playback test involved playing a movie until the battery died, and here, albeit smaller, improvements with the battery life have also been noticed: 7.73 hours compared to 6.65 hours."