This is an excerpt from Slashgear's review.....
The battery life here is pretty excellent, just like the HTC One X on AT&T and the HTC One S on T-Mobile, youíve got the Qualcomm Snapdragon S4 backing your whole system up with its ability to stay strong without draining the life out of your day via the battery. Count on this device to last you what itís lasted us, that being 10+ hours a pop with heavy use, no problem. If youíre the type of person who only uses a device lightly during the day, donít worry about charging it up except at night when you head to bed Ė always a good practice anyway
HTC EVO 4G LTE Review - SlashGear