Friend of mine just bought the roughstack maxi kit for me and it has set up for 6vlts so got a 18650 battery to get 3.7 volts but which battery or batteries do I need to get 5volt? I am thinking the 5vlt NiMH batteries that Nhaler sales will give me 5volts but not really sure so before getting some wanted to make sure. Thanks in advance for helping out a newbie in the mods.