I usually vape on my iTaste MVP 2.0. Used it for over a year exclusively and the internal battery seems not to hold a good charge anymore. I am still debating on whether to buy a new MVP, or try something else. So I was discussing this with my FIL, and he gave me his iTaste VTR with two Efest high drain IMR 18650 3.7V 30A 2100 mAh rechargable batteries. I would like to vape longer without having to swap batteries. What would y'all suggest? I visited the website and dl'ed the VTR manual, but it is confusingly vague with all these battery variances.
http://www.innokin.com/manuals/itaste VTR.pdf
http://www.innokin.com/manuals/itaste VTR.pdf