2 nimh Cell charging
 

i read the 2.4v Charger Conversion for charging 2 cell and the way it look. isn't that shorting out the batterys

Do you mean this one:

http://tinyrc.com/qfm/racing/mod_07.htm#26

If so, then no, you're going red to red, black to black, just bypassing the other circuitry.