Eight letter word riddle – Can you figure it out?

Who knows the answer to this 8 letter word riddle?

I am an 8 letter word
Most humans would like to have me.
But they hate the first 4 letters of my name.
If you get the 2nd, 3rd and 4th letter you are sick.
The 5th, 6th and 7th is something with a charge.
What am I?