no , you have to use two . Actually I told you the wrong way . It would only get 7 volts that way . Cut the old plugs off the box , on one new connector connect the red to red wire onthe box . Connect that black wire on the new plug to the red wire on the other new plug and connect the remaining black wire on the plug to the black wire on the box . This way you will be giving the proper voltage to the box . Better yet , just get a gell cell from your LHS . Or a hobby supplier .