Looked at the GG, it comes with the 901/KR808 adapter.
With that adapter you can use any of the V4L cartomisers. I'd stick with the 3.7 volt battery. 7.2 Volts might burn out any of the cartomisers and go through
juice like tap water. I find that the premium cartos are best at 3.7... even with a 5 volt passthrough, they seem a bit harsh to me.