The battery life on the EVO is nothing compared to the BlackBerry, and yes 4G does drain the battery quicker, just as 3G did on the 9000 when it was released and everyone wanted to switch to 2G only to preserve battery life.
However, you can disable 4G very easily with a widget on your home screens.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]