Adding another battery
What's the easiest way to add another 12 volt battery to a 24 volt set-up to make it 36 volt, I want to do it to the Canadian Tire Izip. I don't mind charging the 12 volt on a seperate charger, can I add the 12 volt by attaching the negative to the positive and the positive to the negative on one of the batteries in the Izip box, and use a trailer type connection between the new 12 volt and the Izip box?
I'm a newbie, so be gentle.