Laptop Magazine has an in-depth review of the HTC Sensation 4G, which is nearly identical to the 3G version to be released in the Philippines shortly. Running their typical battery life test for laptops the HTC Sensations battery 7 hours and 12 minutes of web surfing via 4G. That may not sound like much till you factor in that the test is based on continuous web browsing and not on typical smartphone use. That result is also a lot better than the T-Mobile G2x (a T-Mobile branded LG Optimus 2x), which ran for only 4 hours and 38 minutes.
The HTC Sensation battery life watches the 7 hours and 5 minutes of the energy efficient Samsung Galaxy SII. Looks like HTC has a winner.