I am 7 Letter word. Who am I ?

I am a 7 Letter word

I am a 7 Letter word
Most Humans want 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 letter are something with charge.
Who am I ?

Click here for Answer

7 Letter word - BILLION
First 4 Letters - BILL
2,3,4th Letters - ILL
5,6,7th Letters - ION