Hi and welcome. You invader is a regulated mod, so the idea is the mod worries about resistance for you. It is, unfortunately, still possible to get into trouble if you use low discharge rate batteries with a high watt setting. Still worse, "Brown IMR 3000mAh" batteries doesn't tell me much. They might be LG HE4s-- those are good ones-- or not. Can you post a pic of the writing and codes on the side of the battery, or copy it down for me? That should help me determine what cell you have. For right now, if we assume the 3000mAh rating is correct, they are unlikely to be rated more than 20A. A good rule f thumb with regulated mods is 60 watts per 20A battery. Keep your invader under 120 watts and you should be fine.