On some of the presell sites for the IPV3, which uses dual 18650"s, it says to use 30 amp batteries. I mainly pre-ordered this mod for battery life. Don't expect to go over 20 or 30 watts at this time. Would I still need 30 amp batteries or would 20 amp, which I already have, work OK? VTC 5's are non existent to buy at this time and I only own one. Thanks