David Pogue:

If you charge this phone all night long, then leave the house at 8 a.m., you’ll find its battery charge at 50 percent by early afternoon, even if you don’t make a single call or send a single e-mail message. By quitting time, or dinner time if you’re lucky, it’s completely dead. On this phone, the battery gauge practically shrivels as you’re looking at it.

His review all around is not good – read it before you buy. I have been seeing this over and over again on the web with regards to the EVO – wait for another 4G phone, because the EVO is not it.