I bought the 650mAh white rhino kit. I want to get some extra batteries with more power. Unfortunately white rhino only sells kits. Any suggestions? Also, i wanted to know what i should look into for a 'stronger' hit. Is it the battery or the liquid that makes a difference? If its the battery where can i get spares for cheap and that are compatible with the clear cartomizer that comes with the white rhino (since i bought extras of that)?