Hey, I'm new to vaping. I purchased the kanger tech subox mini also. I'm looking into buying new batteries. The question I have is, I'm running a 3.7V 3000mAh battery, what's the main difference running a 2500mAh upwards to a 5000mAh battery? Again i'm new to all this so please explain it so I can understand. Also, would I need to purchase a flat top or a button top, what's the main difference between those? Thanks!!