Hi can anybody tell me if the f-super can check the charging system in particular if the smart charge system is working my reason for asking is that my battery keeps going flat over night or if the stereo is on in the car with the ignition off for around 15 mins I would like to check this out before spending money on a new battery. I have used a meter with the engine running and I'm getting around 14.4 volts any help welcomed

Thanks in advance

Chris