You definitely will notice, but I also purchased a 510 screw on volt meter. It can show you the voltage of your battery when screwed on the mod, and then screw on an atty to the other side and you can see the voltage drop. The voltage drop helps you compare how hard a different mech will hit next to another mech with the same atty. I mostly use it just to see when I notice the voltage drop, and there is a limit to how low you discharge batts without doing damage to the batt.