Icharger load resistor question.
 

So this past indoor season I put together a homemade resistor bank for my Icharger 308 duo. I've been using it on my 2s lipos with no problems. I'd like to be able to discharge my 4s batteries in the same way. Could I just put another resistor bank in series with the one I have to handle the increased voltage? I makes sense in my head I just wanted to ask around before I release the ghost on my equipment. I hope I'm asking the question correctly.