Check out the innokin plexar Kit. As for which battery to choose,
From: Bench Retest Results: Molicel P42A 4000mAh 21700...beats 40T, one of the best batteries availableThe P42A is my choice for best all-around performing cell of any size and best choice for a regulated mod for use from about 40W-90W each (80W-180W in a two-battery mod). Below that there are ultra-high capacity cells like the Samsung 50E2 that are a better choice. At above 90W each or so the Samsung 30T could be the better choice. Try the P42A and 30T and see which performs better for the way you vape.