Originally Posted by CraigMBA

One of the guys I race with was changing batteries between rounds and said "Oh Sh** which one of these did I charge?" and I looked at him and asked "you have more than one battery?"

I never change my battery. One of the things I've been doing lately is going to the track with whatever setup I'm going to run that day, and just messing with the motor and nothing else. I look at lap times, motor temps, and how many MHA the battery takes to see if I'm making progress or not (usually, faster lap times and more MHA means you are making more power, but it might mean the track had more grip and you could beat on the throttle more).